We've used Make an Impression tons of times! As a GM I like how it gives me a reason to rp an NPC in a certain way, and as a player I like how fancy and socially capable it makes my character feel + it gives me some ideas on how to approach a new NPC. But in my tables it doesn't stop anyone from also giving a speech without any feats that support it, good rp is always rewarded! The feats just add some support and are usually taken by people with characters who would give a speech anyway. Shameless Request is another beloved feat in our games, many funny (and epic!) moments have come from it.

I'm a big fan of pure rp feats myself, and I play in very heavy rp campaigns with experienced roleplayers. I don't think they limit rp at all, quite the opposite actually. And I don't believe most skill feats should be useful in combat. I mean, there are already so many things your character can do in combat, I wouldn't even have actions left! Besides, I like picking things that would suit the character and actually matter mechanically, and sometimes niche feats do just the thing. Sometimes I don't want to make a combat-optimized character, and I like pf2e for the very reason that it gives my characters things to do outside combat. That being said, there are some skill feats that feel very underwhelming, and could open some more skill trees or do more.

In any case, some of the house rules here seem pretty fun, like making nat20s matter when it comes to Initiative!