If you ever had to introduce new people to Supcom or FAF you would know exactly why. Me and a few friends have been trying to get our other group of friends into supreme commander. We play with each other almost 3 times a week (about 4-8 people) but only two of us (me and another guy) has played FAF multiplayer.
This is exactly why I came on and off on the game. I'm lucky SupCom is one of my childhood game due to the cool campaign and atmosphere, but it sucks to learn how to play.
Meanwhile, I easily managed to start top gold in SC2 and climbed somewhat naturally by playing and refining my gameplay. Because it was EASY to get into the game and ladder was a natural continuation of the war started with the campaign. The campaign helps you learn about the units and their role.
With regards to FAF, I've taken several year+ breaks from the game. I first played FAF around 2013-2014 and basically farmed up to 1k rating on gap. I pretty much hated the map, hated the people, and kept blaming noob teammates for why I was losing. So I quit and left FAF for like a year. I came back, played a couple more games, then quit again for a year. Then I came back around 2016, played with Farm, shitposted with him, made a clan, and suddenly I'm now a council member.
In the same vein, the only reason I'm slightly retaining while managing to have a sliver more fun every time I try is because I get better at the game in those crazy team game maps or small team play games. How ? I discovered tutorials finally (in game tutorial were low value, based on memorization), thanks to Heaven RTS.
Heaven RTS especially has an entire channel dedicated to FAF tutorial and even if it is somewhat outdated for stuff, he still has many newbie tips for ecoing, learning BO, explaining everything, explaining units, explaining FACTIONS, explaining gameplay... so now instead of not knowing what to do, I at least have a fundamental structure to rely on.
Recently a more up to date eco/newbie guide was made which is VERY useful, but it doesn't cover enough ground because SupCom is a massive game. More stuff like this needs to be made to help players that seek it instead of repeating the same information over and over. Trainers are the active part of the community trying to help people, but what about the passive knowledge base part of the community ? If it's written nowhere it may as well be a personal art that nobody shares its skills only acquired through experiences and people don't want to suffer dozens of gap or astrocrater games to understand anything at all.
Otherwise, I would have left if I didn't discover that. Because it's so frustrating to find resources about the theory of SupCom. All of them are somewhat outdated, you have to know where to find stuff such as stalking YouTube channels for relevant videos and Wikipedia on the beginner section has a detailed guide for cybran and abridged version for other faction.
Even SupCom2 has a better guide on gamereplay, unfortunately I think it's shafted or unsearchable anymore as the game doesn't appear.
Now the gameplay part. You read those guides and then you want to practice it and try to imitate what you see in guides/cast/execute your strategy.
Well it's difficult because most of the people plays shitty maps and you're tired of Gap and Astro crater. It doesn't incentivize you to have what you imagine as good gameplay, you don't learn much from them besides eco turtle, but they're the fastest way to play. Hopefully with the matchmaking it gets better.
So then you have to host a lobby and wait for people and it can take forever. That can be off putting. Though I have no solution for this problem unfortunately.
Now I’m merely a low rated 1100 player in team game compared to before and still sucks at economy, but I have a bit more fun because sometimes I can make stuff happen. And this is only my opinion, but the conclusion should be : needs more theory and ease of access to it. aka guides and tutorials.