Right now spending bitcoin and one satoshi is no big deal.  I zap and spend all of the time, but what happens way in the future when the value is 1,000 or 10,000 or more times greater.  It could get to the point that requiring a sat is real money and limits the number of people a person can follow.  I admit that is way in the future, but we don't want to design in something that destroys nostr in the future.