And on technical level, Brave still create unique browser fingerprint which could be used to track user.
I think you might be wrong about that, and you need to do more research about this, because brave is randomizing fingerprints each time.
I am not sure how this works on their Tor window, and I am not endorsing Brave browser in any way, just correcting what you said.
I decide to test this feature on my VM. As i expected, not all characteristic is randomized. Brave still send true resolution of the VM screen and time zone of the VM (not UTC). Besides. Brave also make these statement,
Note that Private Windows with Tor Connectivity in Brave are just regular private windows that use Tor as a proxy. Brave does NOT implement most of the privacy protections from Tor Browser.
What if I want absolute anonymity while browsing?
If your personal safety depends on remaining anonymous, we highly recommend using Tor Browser instead of Brave Tor windows.