TBB's default values are dangerous

According to this, TBB 7.0.8 have these values. https://blog.torproject.org/comment/272096#comment-272096

I can also confirmed it by looking at "about:config".

network.IDN_show_punycode = false (expecting TRUE) security.enable_tls = false (TRUE) security.ssl3.rsa_des_ede3_sha = true (FALSE)

Why Tor Browser didn't set these values to expected values?