They all seem fine I guess... but I'm one of the people who finds half-feats to be rather pointless. I'm much more the kind of DM that prefers to do feature swaps or just hand out for free small isolated mechanics that players want/need for their characters because they are usually never worth all that much. Especially not when they would have to spend an entire feat slot or do a level dip just to get it. And on top of that... a lot of these feats are all such minor mechanical bonuses that they probably should all have been in the game to begin with. And if these abilities were worthwhile, we DMs would have already been handing them out to players for years now.
Gain proficiency in a new skill? At first it was "you can't do it"... then several years later in XGtE it was "spend 250 days and a crapton of cash and you can do it", and now several more years later it's "okay, you can do it whenever you want." Does anybody really need permission to now... six years into the game... finally be okay with granting a new skill to someone? Has it now suddenly just become okay? You weren't willing to do it before because it might break something, but now that WotC gives their thumbs up, you're gonna be all right with it? Sorry, but I suspect most of us all knew from the beginning that it was kind of dumb that no PC could ever learn a new skill and thus we've been letting players do it for years now and don't need or want them to have to spend a precious feat slot to now "allow" them to. And who out there has been prohibiting their players from letting them use their shield as a spellcasting focus if any player out there ever really cared about that sort of thing? "Nope... you can't use your shield as your focus, you have to have a rod in your backpack instead!" Really? Has that really been such a thing that they now need to make a feat to allow for it?
Personally... from the beginning I have taken the feat list in the PHB and combined bunches of them together to create full packages of like 5 to 8 minor mechanical benefits that actually have a rather constant impact on the PC who takes them and makes them feel like a different type of character... rather than just being just a worse duplicate of another class. Those things aren't feat worthy, they're just basic mechanics. And that's what I find in this UA... a whole lot of basic.