Doesn’t uBlock Origin in advanced mode do the exact same thing as uMatrix?
https://github.com/gorhill/uBlock/wiki/Advanced-settings
Having tried both, IMHO they do not do exactly the same thing. One is pattern-based, the other is host-based. As such, one can use them together, simultaneously.
Basically uMatrix is so donor to use that anybody can use it. The equivalent uBO section is so complicated that I feel I need to take a master degree in that subject.