Sure, but that comes at a cost.

Say 10 people now reply with 🤙 instead of a the reaction. You can’t easily summarise that (like reactions do). Did they really ‘reply’ when using a 🤙, or really did they really just gesture?

Does this mean my notifications now need filtering of ‘reactions as replies’? Do I need to look at each reply or 🤙, as an individual response?

I’d wager more toward this being a per client app query/display setting for an account, as opposed to a global ‘don’t send me reactions’ preference. Without wide adoption anyway, you’ll still receive reactions - which you can just skip querying for kind 7 in your favourite apps.