We do have some tiling WM, not DE ok, but still enough. Casual users who want DEs are typically former Windows users who have no idea about tiling concept and current sorry state of GNU/Linux DEs it's definitively not good to teach anyone anything except instability, arrogance etc. Bold terms, I know, but the right terms IMVHO when we talk about Gnome or Kde DEs now.
Tiling is VERY good for a PROPER desktop, but actually we miss a proper desktop for the masses, we have Emacs/EXWM, but most X11-based apps can't be sane, proper desktop apps being simply widget based or WebVM-based apps. A proper desktop app is something easy to bend by the user, flexible, automatable, not a rigid tool where the user can't do much more than clicking around and have only cut/copy/paste IPCs and even very limited.
Tiling is VERY good for a PROPER desktop, but actually we miss a proper desktop for the masses, we have Emacs/EXWM, but most X11-based apps can't be sane, proper desktop apps being simply widget based or WebVM-based apps. A proper desktop app is something easy to bend by the user, flexible, automatable, not a rigid tool where the user can't do much more than clicking around and have only cut/copy/paste IPCs and even very limited.