If fingerprinting is the primary concern then bundling should solve that, right?
Yep - get more people using the same setup and have a larger crowd to hide in.
Altho I think the new security slider in Tor Browser effectively breaks that crowd out into those groups plus any individual whitelisting the user allows
I think it should just default the settings to the highest security level, but understand the design requirement that many users use Tor as their primary browser so need video, JAR's etc.
The main concern with adding uBlock Origin would be flipping bits that make your browser unique and stand out in the crowd. You can evaluate that risk based on your own operational profile.
[1] https://mailman.boum.org/pipermail/tails-dev/2016-January/01...