Been a problem for a long time and thank fully people like alex gillon are starting to raise the problem and we need more. Career mode isnt fun if the AI isnt balanced and you constantly need to tweak or change it. For example you can easily do 110 AI around Spa, but around hungary or silverstone its impossible without setup to get to that pace. At the moment im doing 20/30 laps in time trial and using AI calculator to try find the right difficulty with default setup. Its not fun to do. Please balance the AI so you can put it for example on 105 Difficulty and you dont have to change it for every track, and can have a fun competitive experience. I understand it may be a challenge with the number difficulty system, then maybe change it back to easy, medium, hard, legendary. Would make career mode incrementally a lot better and would make a much better experience for every player.
We need more people raising this point because it breaks career mode. Its like playing FC 25 and having it on legendary and beating man city 6-0 but then you cant beat Plymouth on the same level.