The more you add, the more unique your browser is to fingerprinting and such. Probably a bit overkill. I use the multi-account containers to keep "what if" browsing away from ruining recommendations on the same site while staying logged in. Ublock origin is for the actual privacy benefits.
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Well yes, but I am trying to figure out if Strict Protection and different containers overlap in what they do. If yes, I don't see why FF maintains and promotes all of them. Facebook Container seems like a single-case Multi-account Container, and Strict Protection seems to block cross-site cookies anyway.
On fingerprinting, perhaps switching languages, addons etc on/off would confuse trackers. FF could even do that automatically.