It's also easy to understand why.
Google is not the same company Mozilla partnered with decades ago. You can listen to retrospectives from Mozilla engineers, and you sense a desire to bite the corrupted hand that feeds.
However, for Mozilla to be the bold, it needs funding diversity, and that isn't going to come from a browser alone.
I have not agreed with everything Mozilla has thrown against the wall, but I sincerely hope something sticks. We need it to.