It’s awesome! I’m running this since years without any problems.

Don’t know myself as I have no use case for that setup, but it is a well known setup since several years. If teh performance was bad it wouldn’t be recommended as an alternative as often.

JBOD via mergerfs and snapraid on top for parity is a possible solution.

Relevant part from the blog post:

What are we doing differently in Firefox? WebRequest

One of the most controversial changes of Chrome’s MV3 approach is the removal of blocking WebRequest, which provides a level of power and flexibility that is critical to enabling advanced privacy and content blocking features. Unfortunately, that power has also been used to harm users in a variety of ways. Chrome’s solution in MV3 was to define a more narrowly scoped API (declarativeNetRequest) as a replacement. However, this will limit the capabilities of certain types of privacy extensions without adequate replacement.

Mozilla will maintain support for blocking WebRequest in MV3. To maximize compatibility with other browsers, we will also ship support for declarativeNetRequest. We will continue to work with content blockers and other key consumers of this API to identify current and future alternatives where appropriate. Content blocking is one of the most important use cases for extensions, and we are committed to ensuring that Firefox users have access to the best privacy tools available.

wefwef is the best, I really stopped caring about all the other apps being under development. Just mind that using it with Firefox really is absolutely lagging (which is kind of a shame) and that (currently) Chrome gets you the best performance. Feels like a native Android app.

What does that mean and how does it change the game?

Edit: nevermind, someone further down explained already.