Wouldn't it be easier to put labels on the ancient control panels rather than use 2 monitors and paint to describe what things do?
No, it would look like crap, cramped, and cheesy. let's be real, the stickers would likely be on a clear background (ugly, cheap) and because no one really cares about the quality of a sticker ( I understand their lack of care) it would begin to peel around the edges (doggy ear) and then dirt, grim, and dust would collect under it and, BAM, it would look like shit.
Now if the stickers had a nice font and were die cut, sure, I would say go for it, but very few people care about researching solutions these days. Especially as something as small as stickers.
I can imagine it now, me suggesting some stickers that are die cut, a nice font, and from a really nice manufacture and then my boss or owner (whoever makes the financial decisions) would turn his nose up say something to the nature of, "who cares, it's a fucking sticker," and get it done for 50 cents and call it good.