I've been maintaining my own guitars for over a year. They eventually need a little TLC after many years and no matter how much I believe I know everything; something falls off and takes me completely by surprise 🤣 So I wouldn't worry about intonation problems, guitars break down all the time and were built to be modified, fixed. Same for strings and other components. Even if you're not a DIYer, reading books by Dan Erlewine will provide some tremendously helpful insight.

In closing, I get to play with tools. Caveman instincts compensated for. Okay, I'll shut up now :D