While that's true in most cases, it's not always true. There have been examples of inexperienced people proposing a solution to a problem that actually turned out to be better or correct. Two examples that come to my mind are:

• One person suggesting to Elon Musk on Twitter to light all the engines of Starship during landing and shutting off two of them. If any engine fails you don't choose it to be the one you rely on for landing.

• One guy accidentally proving a mathematical hypothesis in a thread about the anime The Melancholy of Harui Suzumiya on 4chan.

Quite funny, although these are, of course, exceptions.