Careful, you might prompt some nutjobs to lecture us all on the evils of permanently storing cups of coffee in the holy ledger. 
Coffee is fine. Even scrap payments of 0.005 BTC is OK. Just don't complain about the fees.
Well, let's say in 10 years Bitcoin is widely used worldwide.
What would the fee be for a cup of coffee? Because if it's too high no one will use it for such payments which is a shame. Of course, that's where LN would solve things to make it cheaper, but it's not "inside the chain". It doesn't feel like "real Bitcoin" or something. But I also don't see any other solutions for this problem. Centralized nodes is a worst case scenario.