MagicBane already uses RIO. RIO doesn't specify anything about the capabilities model its just a pattern. As noted in the ticket, the nice thing about Data Has

MagicBane already uses RIO. RIO doesn't specify anything about the capabilities model its just a pattern. As noted in the ticket, the nice thing about Data Has is it already has instances for tuples. This is really handy in - for example - init code where you may want to have logging and config capabilities before the rest of your env is setup. But I agree its probably not worth the cost and the single parameter pattern is better.