I don't think we have any in our group, but I don't see why they should be of much concern. They are not that different from "level divided by 3, minimum 2" but you already have the number, since your proficiency bonus should be written in large font on your character sheet.
It is also purposefully designed to increase for multiclass characters. But then, I think you need to see each ability separately, whether it also increases in magnitudes by character or class level. It is hard to tell about the idea as a whole.