The beauty of the M12, and similar Bosch (and Makita 12v max)tools is the compactness of the entire tool with the battery installed. When you hang the battery pack from the end of it, then I think it's a totally different tool.
BTW I like those compact Makitas - just not as a replacement for the M12 style tools.
I get what you're saying, but hanging the battery off the bottom usually doesn't impede access, it's the length of the tool from the **** end to the tip. The M12 tools aren't that compact, in fact the impact and screwdriver are LONGER than their 18v counterparts. Versus the Bosch tools, they're like 25-50% larger.
Comparison from instagram of the 12v Fuel vs the subcompact Makita:
<blockquote class="instagram-media" data-instgrm-captioned data-instgrm-version="7" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:658px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);"><div style="padding:8px;"> <div style=" background:#F8F8F8; line-height:0; margin-top:40px; padding:54.7685185185% 0; text-align:center; width:100%;"> <div style=" background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACwAAAAsCAMAAAApWqozAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAMUExURczMzPf399fX1+bm5mzY9AMAAADiSURBVDjLvZXbEsMgCES5/P8/t9FuRVCRmU73JWlzosgSIIZURCjo/ad+EQJJB4Hv8BFt+IDpQoCx1wjOSBFhh2XssxEIYn3ulI/6MNReE07UIWJEv8UEOWDS88LY97kqyTliJKKtuYBbruAyVh5wOHiXmpi5we58Ek028czwyuQdLKPG1Bkb4NnM+VeAnfHqn1k4+GPT6uGQcvu2h2OVuIf/gWUFyy8OWEpdyZSa3aVCqpVoVvzZZ2VTnn2wU8qzVjDDetO90GSy9mVLqtgYSy231MxrY6I2gGqjrTY0L8fxCxfCBbhWrsYYAAAAAElFTkSuQmCC); display:block; height:44px; margin:0 auto -44px; position:relative; top:-22px; width:44px;"></div></div> <p style=" margin:8px 0 0 0; padding:0 4px;"> <a href="https://www.instagram.com/p/BK909JkhuP5/" style=" color:#000; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none; word-wrap:break-word;" target="_blank">Haven't you heard? Black is the new black!!! Makita XFD11 18v SUBCOMPACT next to the compact 12v fuel drill. This is insane! This will be my favorite drill for a long time������ #construction #makita #makitatools #18v #cordless #cordlesstools #powertools</a></p> <p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;">A photo posted by Worksmarter With Better Tools (@toolpig) on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="2016-09-30T04:06:35+00:00">Sep 29, 2016 at 9:06pm PDT</time></p></div></blockquote> <script async defer src="//platform.instagram.com/en_US/embeds.js"></script> <blockquote class="instagram-media" data-instgrm-captioned data-instgrm-version="7" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:658px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);"><div style="padding:8px;"> <div style=" background:#F8F8F8; line-height:0; margin-top:40px; padding:50.0% 0; text-align:center; width:100%;"> <div style=" background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACwAAAAsCAMAAAApWqozAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAMUExURczMzPf399fX1+bm5mzY9AMAAADiSURBVDjLvZXbEsMgCES5/P8/t9FuRVCRmU73JWlzosgSIIZURCjo/ad+EQJJB4Hv8BFt+IDpQoCx1wjOSBFhh2XssxEIYn3ulI/6MNReE07UIWJEv8UEOWDS88LY97kqyTliJKKtuYBbruAyVh5wOHiXmpi5we58Ek028czwyuQdLKPG1Bkb4NnM+VeAnfHqn1k4+GPT6uGQcvu2h2OVuIf/gWUFyy8OWEpdyZSa3aVCqpVoVvzZZ2VTnn2wU8qzVjDDetO90GSy9mVLqtgYSy231MxrY6I2gGqjrTY0L8fxCxfCBbhWrsYYAAAAAElFTkSuQmCC); display:block; height:44px; margin:0 auto -44px; position:relative; top:-22px; width:44px;"></div></div> <p style=" margin:8px 0 0 0; padding:0 4px;"> <a href="https://www.instagram.com/p/BK9z-HcBmag/" style=" color:#000; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none; word-wrap:break-word;" target="_blank">Smaller and more powerful than the 12v fuel impact driver! This is really a sweet sweet impact. The XDT15 from Makita. This is part of a kit with the worlds smallest 18v brushless drill the XFD11 the kit is CX200RB I got this one from @aokpower they are one of the very first to get these in the US. They repair and sell tools and outdoor power equipment check them out and give them a follow! #Powertools #makitacordless #makitatools #makita #construction #outdoorpowerequipment #toolrepairs</a></p> <p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;">A photo posted by Worksmarter With Better Tools (@toolpig) on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="2016-09-30T03:57:59+00:00">Sep 29, 2016 at 8:57pm PDT</time></p></div></blockquote> <script async defer src="//platform.instagram.com/en_US/embeds.js"></script>
Screengrab from a Youtube video.
M12 Fuel screwdriver vs Bosch brushless.
The 1/4 hex impact is almost the same length front to back as my 300 ft lb Metabo brushless gun.