I was excited by the features, too - lightning address, nostr key integration etc. - and opened a wallet with them. Imported my existing nostr keys and added the LN address to my profile. Result: Nostr integration failed, pubkey remained different from the account I wanted to use it with. And when trying to send funds to and from the lightning address it showed errors. I contacted the support for assistance and never got a response. This may be reasons why they are not recommended, including by me.