The current formula scales so that as the level cap increases, you need more of the same stat to maintain effectiveness, but there will be a small increase in overall effectiveness with the stats you can get at that level. For example, 250 size at level 500 will be much less impactful than 250 size right now.
We are not going with softcaps or we limit builds that may not even be problematic. The real problematic builds are the ones that would minmax and abuse a system like this.
Attack size is currently only problematic on a select few skills, which will be addressed on an individual basis. There is no need to nerf or cap the scaling with this philosophy, as it would hurt attack size builds that are not problematic whatsoever.