Hilarious comments - and I always enjoy the ever so judgemental "if tastefully done", as that is something COMPLETELY within the eye of the beholder. For example, someone might say legally renaming yourself Neo Skywalker is tasteful, some might say not
Fact is being able to mod our pinball machines is one of the many reasons many of us are in this, to some degree, or at least it helps a lot with the longevity, and the constant desire to upgrade or make better our machines.
As for the question, I can't say too many issues from too many mods comes up much. I have always wondered this, as the already stressed 5v line seems like anything else should affect something, especially with LED displays that use that, but the less stressed 12v line, I believe, should be the most stable.
But again, I don't recall any threads were the conclusion of any issue was too much current drawn from too many mods.