Lightning has had lots of problems, but most of those are fixable through software or gets better and better with adoption (at least in theory).
The reason adoption has been so low is that with current hardware you cannot run a full node in a phone, so you either get a server to run a full node or you trade-off some control/security of your coins
There are still other theoretical problems, mostly things like denial-of-services, but adoption has been what has stagnated it.
The hardware/control tradeoff is a real PITA, we need a phone with like 50x more battery or efficient to be able to run lightning in a completely self-custodial manner
And there are still some people advocating for blocksize increase, which will make the problems of lightning even worse
