I like a lot about this, I'm a big fan of a process that makes getting into the game easier, and lowers barriers. I do have one thing I feel could be improved on, and one concern I'd like to talk about.
I don't feel the idea of sitting down in front of a tablet is better than placing tokens on a player mat. One of the strengths of TD is the physical experience, and this includes the tactile experience of handling tokens, seeing the layout, putting tokens onto slots, and the wonder of hinting at there being so much more than what their ten tokens can cover. I do question a little bit the comparison to CCG sealed, as the complexity of drafting decks usually means making choices of what to cut which is where new players struggle. TD in sealed would rarely have this, as the obvious answer is to use everything, which is fun for new players to play with all their cool toys.
The area I wonder about is the connection with established players, or lack thereof. I feel that one of the best advantages of TD is the community element. Established players have little incentive to do a run with that amount of repetition of known information, and I feel that this is a significant loss to not have new players have some connection with those who have done it before. I had a run last Gen Con, and I was the only player who had any experience. I felt a responsibility to help others have a good time, and overall, I do believe the group enjoyed it, though I don't know how much was based on what I did. It has made me consider a bit about being an ambassador to new players, which I'm still mulling over.