Appreciate the breakdown, I don't know much about how shitcoin wallets work, but I remember having a trust wallet back in the day and that seed phrase I could use to spin up wallets on different chains now that I think of it, I mean it would be pretty annoying to requir a seed for each blockchain and as a shitcoiner, they always opt for convenience.
But yes my concern is even if it's all on the same private key how was that key accessed in the first place, but then again why are you signing directly from ledger, sigh!