This honestly is my biggest desire right now for Primal and the single thing that keeps me using Damus and Nostrudel if I'm on mobile or desktop. It stinks because people are engaging (even if it is negligible) and I'd like to be able to return volley.

Primal including other reactions would also make nostr's network effect less biased in favor of centralization-minded people. Right now, Primal's trending feeds are basically nostr's biggest content discovery system, and the trending system is biased to favor the opinions of people who use Primal instead of apps that support emoji reactions, since Primal doesn't count those reactions.