The idea behind nutzaps, not the way they are used now, is that you rarely settle them over lightning. This way SATs can circulate between npubs as zaps with no fees. You keep them on the mint you recieved then on and trade them around for free. You can settle them once you have enough accumulated on a particular mint. You can also move them from one mint to another (maybe move them off a public mint onto your own mint), or you can simply use it to pay for things. The power of nuts is you can consolidate small zaps into one large LN transaction and/or an on-chain uxto.