Obvs if you select four out of four things it makes the trivial decision for you, but if I get three options out of four with my Courtier, I want to check three boxes to select what I want, even though that is "less efficient" than clicking one out of four buttons.
In other news, I just played a Page game where I spent several turns not exchanging my Pages for T-hunters because I was confused by the interface. I thought that I should click the button that said "exchange" because then I would be exchanging them.
Obviously the X over the pictures helps, it's what made me realize I was doing something wrong (yes I didn't realize it when I never saw T-hunters in my deck after two shuffles, it was the X. Feel free to make fun of me for this). And yeah I get the intent of it now, but I don't think I'm a complete idiot and I was confused by it.
What would I suggest instead? I'm not sure tbh, I haven't completely thought it through. Maybe if there were two buttons, one that said "keep" and one that said "exchange" and you could toggle between them somehow, and it was obvious which one was active? I dunno.
I also found it weird that I needed to confirm the card I trashed to my Expand before choosing what to gain. I realize the intent is to be able to undo it but I think you can still do that while selecting the card you want to gain. I have not thought this through.