Fun fact from #hcpp24:

I asked one of the crew how many payments during the conference she would estimate have been done via #LightningNetwork vs #Monero. She said about 30% XMR, but that she wished everyone used Lightning, because of how slow the Monero payments are.

Point of Sale is just bad UX for anything taking longer than a few seconds. Only really committed merchants will tolerate that, and even then it's rough for them.