Harmony - Troop Symmetry

There was such an idea in Heroes of Might and Magic V. There, a bonus of +1 to a characteristic was given for every 7 levels. And dredknight explained very well that +15/15 at level thirty is even weaker than +4/0 for each creature. But, to be honest, I almost never noticed the difference (these 20% to damage), while one powerful creature is clearly noticeable. In general, when I took a specialization that gave a bonus to a characteristic, I felt like I was being cheated. The bonus from such specializations was low, and therefore boring. The bonuses to spell power and knowledge were also explained to me very well, but "Panikovsky doesn't believe it! Panikovsky is not obliged to believe everything!".
So, one such bonus is clearly not very good; it's just the thing to strengthen useless heroes.