It's infuriating. In fm17 I managed Ross county and we won CL in 2020 and the year after we won everything else, world club cup, cl and everything in Scotland. Our stadium was at capacity every single game and held like 13k or something I don't remember the specifics but they wouldn't build a new one after asking how many times.
I threatened to take it to the public and told them they'd lose backing from the fans. They told me the fans would get over it and sacked me on the spot.