[tor-talk] Tor Browser Linux_don't extract to root

[Joe Btfsplk]

What is the reason(s) the TBB instructions say do not install (extract) 
TBB to root?
Is it so the TBB files will be in a location where the user has write 
permissions, so that TBB updates can automatically  D/L and install?

Other than that, does installing TBB to a location where anyone / 
anything has full r/w/x permissions (like in /home), weaken the security 
of Linux, compared to packages installed via a distro's software manager?