Monero is on chain, right. It has a block time of 2 min which is very good. But ag least your payment goes through, Lightning has no guarantee for that. The fees for Monero are super cheap, with LN you can have some super bad experience. You cannloose money with Lightning etc etc. So the tradr offs for Monero are much less. And LN will go down as soon as the whole infra will need licences and that will come.