First of all I will list the kinds of quitting "possibilities" For Honor has:
-"back to main menu" with in-game option window
-closing the application
-disconnect from the internet
-losing the connection to the lobby

The second and third option leads you to the title screen of For Honor. And this is where a change needs to be implemented. Because now it is totally unfair for players who actually lose their connection to the lobby they were playing in. They get punished for a flaw in the game while other players can quit whenever they want.

My idea:
Since closing the application or disconnecting from the internet leads you to the title screen of For Honor, the game should automatically realise, that the first screen after quitting a match is the title screen and should punish players accordingly.
And yes, losing the connection to the lobby leads you to main menu.
Losing the connection to the Ubisoft servers is most likely your provider's fault and players with a bad internet connection should be punished (since it's already infuriating to play against them).

This should reduce quitting by a lot.