In this day and age, you absolutely must use a computer to make a video game; and, no, "users making their own content using our editor built into the game itself" doesn't count. I'm talking about the base game that you purchase to use that editor.
Given that you made the game using a computer and special hardware is required to test/run it on anything else (PS4/5 Dev machines, etc). Why do games come out on, say, just a console? The basic testing prior to copying files over to a console for specific-issue testing is performed on a computer, programming is done on a computer, compiling is done on a computer, etc.
You actually have to do more work to release something exclusive to a console.
So, to re-iterate, why aren't games always released for home computers?