I didn't say that I liked the cap of 5 ability points - I'm not a big fan of that in fact, for a lot of the same reasons you don't like it.
I especially don't like the hard cap which counts bonuses from Talents, Traits and Gear. I just don't have any good ideas on how to change it. I don't know if it'll stay or be changed in the final version. The maximum player level is supposed to be about 20, the last I heard.
There was
a post in the General Feedback thread which suggested that Primary Attributes could determine whether you could equip things, and the Ability determines how good you are with it. That system sounds good to me.
Yes, that system would require you to put points into Strength to use armour and weapons, but the points into the abilities would determine how well they worked.
Why not put level requirements on abilities?
Level requirements on abilities would certainly be one way to solve stacking ability points and getting them up early.
Player level 1-4: Ability Rank 1
Player level 5-8: Ability Rank 2
Player level 9-12: Ability Rank 3
Player level 13-16: Ability Rank 4
Player level 17+: Ability Rank 5
It might be seen as too restrictive though. I'm sure at least some players would grump at that.