To me the reason of the problem seems managers wanting any app they would invest into to be a show rather than a tool + under their total control (no local install), also the labor market over-saturating with amateur web developers. WinForms was almost perfect and could become perfect with some improvement but it couldn't look fancy enough for them. I still struggle to find a platform which would let me implement my ideas as fluently as WinForms (while I also don't want to stick with WinFoms because it still has some bottlenecks).

Just to give you all heads up, only the first part of the article is available for free, the rest of the article is behind a paywall.