The UX could be improved, no doubt. But the alternative is inventing a secure, bespoke, posthumous seed-transfer scheme.

At least with DMTX, a standardized procedure could be developed and published in advance. This has privacy implications. Everything has tradeoffs.

The point is that Bitcoin is peer-to-peer, programmable money. It is superior to all other forms in this regard. Your heirs will need to be competent in order to inherit. They should have their own key setup for their level of expertise to receive coin directly.