Butterfly impacts are OK, the problem is bits.
I've never damaged anything with the manual impact because the hammer provides all the downforce, and the duration is very short.
Most things come out with a couple mild whacks, yes I've broken tips but it was 100% uneventful. The tool seems to almost bounce away from the work, unlike a gun driven bit which walks across your work after shearing off.
How many times have you left chuck marks on the work when using a hand drill on metal? It's because you can't react fast enough!
Real impacts (which I also have) save your arms but tear stuff UP.
How do you think a customer feels when their machine is down because I hamfisted a fastner?
How do you think I feel having repair a mess on someone's showbike?
"Oh uh.. hey John what is this bolt that doesn't match the rest?"
Bits ALWAYS break with enough use, and sometimes right out of the box if approaching their limitations (or flawed)
Impact screwguns may be new among the general polulation, but n the roof we used impact guns like the DW267. This vid gives you and idea, it's basically the first gun with a cord. https://www.youtube.com/watch?v=LGrwvkZGWMg
That is an impact driver, NOT a drywall gun clutch.
He runs too slow, always UP the roof never across.
Yes we had races UP THE ROOF with the gun! 127' panel with a screw every 12" GO!
I never shut my gun off, just lock the trigger, and have sent almost a dozen to the graveyard after replacing multpile sets of brushes.
At one point I actually had trouble moving up because I screwed so fast, that's all they'd let me do
so I bet myself into a new position winnning races.
700 square (square is 100ftx100ft) standing seam with continuous clip, 6" spacing within 4ft of edge and 12" spacing in the field, or short clips double screwed 24" on center.
The iso board got 5 screws per sheet 4x8.
The DensGlass got 8 screws per sheet 4x8.
The coping cap clip got screws at 24"
The dripedge got screwed, then the panel edges got screwed every 6"
The ridge cap clips got screwed on 24".
I worked the roof at the new Orange County Convention Center 10,000 square of Fibertite!
We went though PALLETS of screws!
I busted more tips than most people have run screws in their life, and in one day run through a normal lifetime of screws!
Every day, for months and years.
All due respect, you can't tell me a thing about it.
Still don't believe me? Ask OP, he broke a couple too
When I see someone doing the same thing which has caused me grief I try and give them the benefit of learning from my mistakes, and I have walked many a freshly busted bit across some expensive work!
Good judgement comes from experience, experience all too often comes from mistakes.