I still have a small selection of altcoins that I felt were worth keeping and stablecoins on my Ledger. I felt like it's better to move my bitcoin to other hardware wallets but I am ok to keep my alts on Ledger. The alternative coins I have are supported by my Trezor as well, but I have the Bitcoin-only firmware installed on it and want to keep it that way. Centralized stablecoins can be frozen by their issuers anyways, regardless of how and where you keep the keys.