I allow them, but as a DM I also always use point buy or standard array, which means players often, but not always, opt for ASIs over feats.
I also don't tell new players about them. If players are engaged enough to actually read a PHB and want to use them, I'm happy to allow them. If it's something I as DM introduce without the player asking for it, it's a good bet that the feat will end up being one more ability that player will forget their character has and/or need me to explain over and over again during sessions.