Bitcoin on lightning channels is Bitcoin.
Lightning implemetations are still going through their paces but we're at the tail end of #reckless. It's fairly safe with backups but edge cases of issues exist. If you have backups of each state change then you should be able to recover funds. If you rely solely on a node package to do the backups for you, then probably not.
There is no single lightning network. There can be separate ones. It's decentralized but in any decentralized network that attains popularity there will be centralized hub custodians making it easy to use but not operate for those that don't want to mess with self sovereign for every use case.
While Umbrel and other node packages try to provide a one stop shop or GUI setup it really helps to have an understanding of Linux and filesystems and the lightning implementation itself to sort out issues.