Looking at this tweet:

and thinking about how I actually did this to Prime Wheeljack on my second viewing, deciding that he has to deal with fuckoff arm and wrist pain like I do

except he fucking did it to himself, because of course he did -- all of his integrated weaponry is custom, with his engineering background meant to primarily support hand tools, his initial loadout was configured for near-recoilless weaponry like Bumblebee and Smokescreen, but running around doing commando blackops shit (in his mind) necessitated larger firepower and there were no medics around to finger-wag him out of doing whatever upgrades he wanted so now all of his weaponry is a grade or two stronger than his structural components should on paper be able to handle.

As a result his whole upper body has a ton of microfractures from magnetic shear and recoil -- nothing that his self-repair can't handle, but just like with humans, supportive member damage doesn't heal back up to be stronger without very specific kind of physical therapy to accompany it. As a result Wheeljack has actually gained mass and lost a lot of the flexibility and aerodynamic and balance qualities of racer frames, and is maintaining his ability to do trick driving largely through just. Doing it, lmao, and not thinking about his worsening health.