For Die grinders!? I feel like my milwaukee m12 has about the guts of a decent 1/3 hp or crappy 1/2 hp pneumatic grinder. Good for burrs and up to 2" surface conditioning discs but it will over heat and/or draw too much current with larger tools. And it crushes batteries (I'm talking 6.0 here).
Don't get me wrong, I use it all the time, but to say there's no longer a place for air seems a bit much. Are you talking 18 volt? Corded?
Just a figure of speech based on what's used most or what I use most.
Most of what I use is electric but...
But...
Some things we can't get away from...
Example...
Air lines to the tire machine. Still need air there.
I clean rim beads with a CP angle die grinder and rice cake.
BTW...a lot of garages just dismount and mount tires no matter how much debris is on the rim. That's ridiculous!! (We never ever...and I mean ever...get one returned)
Back to the point..
Air is right there and outlets so I leave that CP tool hooked up to air all the time ready to go cleaning rims.
An air hammer is another one. Obviously a specialty item I don't use that often but when I need to hammer on something that Air hammer is king. Mine is a Mac brand and it's the biggest they make.
When you've done this **** long enough you know little tricks to help with removal of things so when I need the air hammer it's a mayday alright and I need a serious one!!
(BTW...it's been rebuilt once in 20 years) I would've replaced it with a new if they weren't so expensive. Die grinders as example are a fraction of that hammer price.
That said what's in my hands more than anything else is impacts and ratchets and angled grinders (cutting)
Probably 90 percent of the time I'm using one of the three.
Here is where I'd never go back to air and I've got some tremendous air tools. From big 3/4" IR guns to an ultra stubby 1/2" impact from CP to a stubby IR ratchet that nearly jumps out the hand with power....
But...
It's been a year, at least, since I've used any of those.
Electric is quicker, less cumbersome, more powerful (for the most part)...integrated lights, etc etc.