The fact that DANE doesn't work on all network paths and it's hard to predict which ones will fail. You have a preference not shared by ordinary computer users, that broken network paths should be loudly broken and not best-effort.

If you care this much about your root set, consider having Claude roll you a Chromium or Firefox with a user-controllable set of roots that you ruthlessly prune and manage. Unlike DANE, which simply isn't going to happen for a whole variety of reasons, your personal root program (I gift that term to you if you want the coinage) actually could help people with your preferences.