[xte]

Well I say something similar in the past, now have seen the GMail evolution path I change my mind, beside that I do not generally use webmails except when I'm with a machine without my environment, my main MUA is notmuch-emacs.

I also agree about TB, classic MUA seems to be remained in the 90's however at leas for us not-basic-users notmuch-emacs, mutt&forks, pine&forks, mu4e etc are valuable options, long to setup-up, mostly because anyone have a personal recipe and no one offer a ready-to-use solution, but far more powerful than any webmails.

However mailpie can be consider a good GMail-inspired webmails and IMVHO for most of mail users Roundcube even if is really basic it's enough, clear, simple and effective. Contacs are a bit limited compared to Google's one but the rest work well.