1. Because the devs dont consider other coins as legitimate form of investment

2. Because most multi crypto wallet are in fact a distinct implementation from LN. LN is not a blockchain. It is in fact a Bitcoin L2 with different architecture

3. Why should bitcoin focused dev focus on building other wallet support for an open source protocol. If the other wallet like, they can always make way for adoption

4. Because vc are not interested. They cant monetize their ponzi on nostr.