In /etc/vim/vimrc from app-editors/vim-core Q is mapped to gq:
" Don't use Ex mode, use Q for formatting
map Q gq
Steps to Reproduce:
1. Start vim
2. Press Q to switch to Ex mode
After a few seconds of confusion i saw "gq" in my status line, since I set
showcmd in my ~/.vimrc (this is not default, using just the vimrc provided by
app-editors/vim-core wouldn't give you a clue).
I expected to enter Ex mode, ofcourse. That's what :help Q says it will do :)
Users who require the Ex mode functionality will know what to change. For general use the map from Q to gq mimics older behaviour and will maintain familiarity for the majority of users.
Suggest -> invalid.
Closing this as WONTFIX, as the Q mapping is consistent with what upstream recommends and what everyone else does.