Serious software vendors do usually provide msi packages for corporate deployments via GPOs. I don't remember having to package myself anything in the last 10 year or so. Maybe had to read some documentation to tune install parameters.
But I agree that it could be so much better.
That, and WinGet really wasn’t a thing until the height of COVID when people really found out that it even existed. There’s still a ton of stuff that doesn’t install quite right in it.