I remember, a while back when I first tried FAF. I was one of the noobs that played with my friends against AI and steered away from multiplayer because of the steep learning curve and my lack of experience made me not want to be a burden to my teammates. I did this for about 2 months. Once I went to give multiplayer a go, you can guess that I got absolutely steamrolled and because of other commitments I didn't have the time to find out why e.g watching replays, watching top player builds and eco calculating. So I continued to stay away from multiplayer and after a while, got bored and left.
I came back to FAF about 2 months ago after a year of not playing, however, I watched basically every video of BRNKs from the last 4 years (Skipped a few phantom videos, they don't help a lot) and then tried multiplayer, still got beaten 3 times before my first win and then got beaten more after that. I reached out on Aeolus and paid someone to teach me a basic multiplayer build and tech times etc. Now I actually win games, still lose a few but I know how to analyze myself.
As for your question, new players either don't have the time or want to put that much effort into learning the multiplayer mechanics by themselves. However, if I had a solution, create a Tab in the client for teaching/learning.
Players can sign up as teachers after 100 games (White ranked) with a rating over 600 and get paired with new players that want to learn the basics. Change the registration forms to include a preferred language option and when the new player logs into FAF create a notification asking them if they would like to be assigned a teacher which will then notify the teacher of the new player's request to learn. Moderation for teachers can be done by the new players based on reporting and rating their teacher.