While it could benefit from some tweaking, the leveling system doesn't feel all that bad for the most part. If you put all your focus points into whatever combat related skills you want at the start, those will level very, very easily, generating a ton of character exp. With the focus points you then get afterwords, you will have more than plenty to invest in the support skills like scouting, leadership, etc, making those level relatively quickly as well. In my most recent play through, my mc had multiple combat skills above 200 and support skills anywhere from 125-200 within about 10 in-game years.
That being said, reaching 250+ is next to impossible unless you focus specifically on one or maybe two skill sets alone. Focus points only increase the learning limit so far and attribute points are far too useless but also far too rare. With how ridiculously easily companions can die, you need to focus everything on the player character to have any kind of a skilled commander. While I still foolishly try to use companions to balance out what I am lacking, most of the perks you want only apply if that specific character is the party/clan leader (as far as i can tell at least).
Basically what I am trying to get at is, focus points feel too strong while attribute points feel next to useless but are also too rare for how mandatory the tiny effect they give is. I don't think the player should be able to become a walking god amongst men with everything at 200+, getting the final perk in even one category comes at the cost of sacrificing almost everything else to do so, which is a bit too punishing imo.