Right. There are devices on the market that lack a mechanism for you to supply (recover) a seed. They’ll generate one for you on the trust-me-bro model.
Discussion
that's disturbing. which devices are this unholy?

Block’s Bitkey and Coinkite’s Tapsigner are two examples.
ohhh. the Bitkey is so tempting though for 25$ especially for new folks.
It would be fine as an addition to a multisig quorum. For example, I wouldn’t use a Ledger or a Bitkey, personally, but a 2-of-2 of a Ledger and a Bitkey is probably good enough for mid-sized cold storage.
yeah, that's the problem, i don't think it's advanced enough to do that. It doesn't actually show the seed. I need to dig into it more...