I don’t hate flatpaks, but flatpaks require more disk space than the same apps from traditional repositories, and they only support a handful of the most common default themes. Since I only ever use older and slower computers, my disk space is limited, and I like to rice my desktop, I personally avoid them. But your use-case may differ.
One good thing doesn’t even outweigh one bad one. What do you call someone who tells 99 truths and one lie?
A liar.
It’s the same here; there’s an asymmetry between doing what’s right and betraying someone’s trust. When Mozilla can demonstrate consistent integrity, maybe I’ll stop using a fork.