Yeah, i think they started out that way (at least the LN part,) but you can connect your LN node to it these days. Also, I like using their "watch only" wallet for my cold storage.

I will say i feel like the browser and "marketplace" hasnt gotten much work on it lately, I think they have been doing more with connecting to nodes, connecting to electrum, coldcard, and multisig stuff. Their desktop wallet is pretty good too.

Theres a BTCSessions tutorial on doing a Bluewallet mobile multisig, and another one connecting bluewallet to an umbrel.

But check out this page, where they list how (suprisingly) interesting this wallet is: (Payjoin, coin control, RBF, CPFP, etc...)