Comment by kjs3

At my last enterprise gig (financial, ~85k employees), when I inventoried apps for cloud migration, there were around 1500 what I guess you'd call 'thick apps', and about 75% of them were some variation of "stubborn thick client Win32 (or .NET) apps that are mission critical". Mission critical to someone, anyway, and the number of apps with 1 or 2 users was kinda eye opening. Noone was going to fund the effort to rewrite them to be cloud native or web based, so there was a lot of lifting and shifting going on.

Many businesses might do better pushing everything to web apps, but SaaS introduces a whole bunch of other issues in highly regulated worlds like finance. It's not always the right answer.