[logn]

They can fix most of this. Tor Browser has addressed some of the easier problems and makes fingerprinting more difficult. If you read the bug reports of major browsers, you'll see the maintainers will usually value compatibility and features over privacy. It would be especially nice if they'd fix the issues with fonts because that's one fingerprinting aspect that's really only solved by modifying the core browser code (unless you remove/add fonts system-wide from your machine to match Tor Browser).

Tor Browser overview: https://www.torproject.org/projects/torbrowser/design/

There's a long tail to fingerprinting that's pretty daunting. E.g., you can detect OS by looking for idiosyncrasies of the low level networking stack. One project did attempt to solve this but hasn't been touched in years: http://ippersonality.sourceforge.net/