I don't get how MS can't just build a control library. You always have to use these expensive third-party closed-source libraries. I remember when the Ribbon U

I don't get how MS can't just build a control library. You always have to use these expensive third-party closed-source libraries. I remember when the Ribbon UI came out. And there were like 10 different vendors making all different ones, each with a different look and feel. Just like Amazon took internal services and made them exposable in AWS, so should Microsoft with every UI component they build. You shouldn't be able to ship any UI internally, unless you make it publically accessible. I guess WinUI 3 is heading in these direction by decoupling from the OS. But boy it took a lot of time!