IntelliJ is written in swing. It’s about the most complex piece of desktop software you’re ever going to use. It’s objectively orders of magnitude more complex

IntelliJ is written in swing. It’s about the most complex piece of desktop software you’re ever going to use. It’s objectively orders of magnitude more complex than a messaging app. Heck, it used to have messaging built in at one point I remember! Also, I’ve done a bit of Qt and while I don’t have an example (I’m sure someone else could supply one- finance back/front office?) it’s predominantly used with C++ which scales to millions of likes of code.