This struck me as a thoughtful and nuanced analysis of the reasons Fedora should embrace flathub, as well as an analysis of the areas in which flathub security and policy needs to be improved before that can happen. It’s worth a read.
For those who won't read the article, here is the conclusion (but please no dogmatic opinionating without reading the article, its nuanced and thoughtful)
Flathub is, frankly, not safe enough to be enabled by default in Fedora Workstation today. But these problems are fixable. Helping Flathub become more trustworthy will be far easier than competing against it by maintaining thousands of Fedora Flatpaks. Enabling Flathub by default should be a strategic priority for Fedora Workstation.