If you report a regression within an -RC series it will be fixed or the commit reverted. Of course, that requires actual testing.
But you’re just reiterating that the kernel development itself lacks sufficient testing which necessitates this. Everyone is a volunteer; the result is as you’d expect.
Look, there’s nothing wrong with this. In reality all the people who are electing to run Linux without it actually having sufficient quality for their purposes are the actual problem, who’d which there are hundreds of companies that just don’t care. We created this situation by undervaluing quality vs cost.
But it’s also the reason it won’t be a success on the desktop. The only way that happens is if windows takes an even more substantial nosedive. Things are going to have to get pretty bad for that to happen.