Migration between vendors w/out need to sweep is one of the most important bitcoin wallet features
Too many vendors closing this door, freedom money requires freedom f/ lock-in
"Scammed Grandma" for her seed is a straw man, she would have swept the funds to the bad guys too
I keep bumping into this issues with many users, this is not some theoretical thing.
Vendors go away, we end up with the mess and ppl stuck.
Seed lock in is the new walletsrecovery.org derivation knightmare all over again.
Call out terrible design decisions driven by pubco lockin tendencies and anti-patern app-devs is not anti-compeitive, its how we got to 100x better setups than Blockchain .info so far.
experiment with new things, that's amazing, don't lock in users, thats evil.