Do you have hard evidence of this affecting new DMs like that? It doesn't seem hard to me to have a new DM make a decision about stealth and sneaking into a live wizard's house and stealing his spellbook. There are a number of different ways that already exist in the rules to get a hold of such a spellbook, and once you do the rules on scribing spells already exist in 5e, so you're done.
I don't see new DMs having an issue with this.
There is no damage. There is no negative influence. All spell versatility does is give some more options as an optional rule. If you like it, use it. If you don't, don't. It's not something that needs to be added to the base game, though.
False Equivalences are false dude.