I noted that about a third are currently below the 32 threshold as it is.
The OP was more countering the argument that Healers have the least buttons (WHM specifically), since that isn't at all true. You ask me why 32 but...then say you know the answer, so...? I don't need to answer it, then?
For my part - as I say all the time with "4 Healer Model" and "new SMN is fine but old SMN should exist as a separate Job" and so on - I like there being different levels of things across the Jobs so we have the highest odds of someone finding at least one they like. Ideally at least one in each role, but just at least one.
Right now, we have a decent spread. 27 for SMN on the low end and 37 for PLD on the high end. I do feel like some of the Jobs (PLD is a particular sore spot) have a lot of buttons that probably should be pruned because they don't bring anything to the Job. On the other hand, as I've also said before, we have Jobs like SCH where most of their buttons actually have a use justifying them existing as a distinct ability and hotbar slot.
I think it's good we have some with a lot, but also good we have some with a little. I do feel some of the ones with a lot should be looked at to see if all those buttons ARE bringing something to the table or not, though. But if they are, I'm not advocating they be changed "just because", or changed at all.