You also might want to look up what an ad hominem is. Hint: Suggesting that someone lacks knowledge about what they are talking about is not. And in particular, it is not logically fallacious to deduce that if someone lacks knowledge that therefore they might be providing unreliable information.

And while you are at it, maybe also look up what "killing the messenger" means and how it is used.

But you are right that the much more fundamental problems that are actually there won't go away if you keep ignoring them.

By the way, the one who claimed that you were not really an expert on this was you, a few posts ago.

Now, if you have any actual specific problems with email that you think a new system would be better able to solve, feel free to explain it, then I can explain more concretely what the problem with your proposal is or how you are missing the actual underlying problem - or possibly accept that you indeed do have a valid point, though I wouldn't be too optimistic about that at the moment.