I played SC, FA and FAF, left for some years and happy to see that my account exists and FAF is alive with at least nr of users in chat comparable with 2015
Good ideas:
1.
@LargeMaleBennis said in Why would you have left FAF?:
an add to the opening page of the client: "YOU ARE NEW: GET HELP HERE" and then a list of people to approach
2.Tutorials are very helpful tool, better to have some more EX: fast build orders for units, templates for building, proper use of patrol; attack, Unit alignment, attack/defence strategy by land; air; water, etc... There are some interesting videos on Youtube
-
Should be explained to New players that patience is needed for a reasonable period of time, to adapt, understand and fell the game.
-
Kindergarden
is a good idea. A place where they can feel save for a while 
-
One of pure advantage is training of Multitasking, and that is real because you have to keep in mind a lot of stuff during a game
P.S. Thank you all for keeping FAF alive 