Also, if Bitkey makes design decisions that make it so other wallet software cannot recover their wallets, I think this is a trade off and should be discussed as such.

If you want to do advanced things, at least make it so you can restore the wallet in Core.

My earlier point about using a public electrum server and the Emergency Kit is that such a recovery flow is significantly more difficult than importing seeds. It's a trade off.

But Bitkey's language about this has not exactly been nuanced. "Seedless is safer" is a strong statement. They are free to market however they like, but my questions about vendor lock in are certainly not as strongly worded as their absolute claims to better safety.

If you wish to pursue clarity, I'm surprised you are willing to accept the "seedless is safer" claim at face value.