@graesslin
It's true that KWin shouldn't have every feature under the sun but I and a lot of users found "smart tiling" actually usefull (just look at the popularity of "Sticky Window Snapping")
This feature perfectly extends "window snapping" (especially on FullHD and HighRes where halves/quarters sometimes may not work and you'll need to align both windows).
IMO, tiled window managers is completely different workflow and not for casual users.

@graesslin
Martin what is you opinion about integration of "smart tiling" (T11086 into KWin? Is it hard to do with current codebase?

@ognarb tiling window manager is a completely different workflow. Also, I'd rather continue using scripts or allign windows with <meta>+right-mouse than refuse from window rules, zoom effect and other nice KWin features.
Thanks @crozbo , you explained it perfectly! I opened this proposal because your task is more complex and looks like "alternative KWin mode". While I want those features as addition to regular mode, especially after seeing how well they work with other DE-s