I would be lost. A lot of thge places I use them are not on cars or really boogered or rusted etc but general service and install, repair. If its humanly possible I am on it with a simple wrench. A lot of my stuff is a turn or 2 or holding, most nuts come off by finger, simply need tightened etc.
They make smaller and they make bigger but my personal standards are 8 inch and 12. You can do about anything with an 8 as you can smaller and simply need the leverage. An 8 will do an LP bottle. Same for 12, can do all a 10 can do and some of an 8 and its so much bigger for power. I got a couple 6's and little stuff but I never use it.
I take the lightest one I can lug around, got a few 10's, do use them, have on occasion where weight was a factor. It will not fit a 3/4 structural nut, a machine nut yes as well as a torch. I carried one in hi rise sign installation, a channelok, number 9, pair of Tstrippers, a couple of screwdrivers and a couple nut drivers.
I hadnt really thought about it but I have these 8 inch in 10 different brands. From 30 yrs ago I would have been extremely predudice against the HF and flea mkt stuff but that HF has integrated itself,,, I bought it on spec to test, figured wtf? Its been in routine use for a long time.