And there's nothing in MV2 that uBlock Origin needs that doesn't exist in MV3 on Firefox, unlike Chrome. This issue is completely overblown.
That's utter bullshit. The author of uBlock Origin has posted a long list of capabilities that declarativeNetRequest does not support.
Are you disputing uBlock Origin's list of MV3-incompatible capabilities [1]?
[1] https://github.com/uBlockOrigin/uBOL-home/wiki/Frequently-as...