peasants revolts were about specific grievances rather than an abstract concept of inequality.

What exactly is the difference? I want equality, and I have a list of specific changes (grievances, if you prefer) that I think would create equality.

Giving the peasants what they wanted would have reduced inequality. I assume the peasants leaders were smart enough to notice that fact.

Peasant revolts were actually pretty rare.

For every revolt large enough to actually make it on to a list like that (about one every generation), how many smaller, historically unimportant defiant acts in favor of equality occurred. The fact that the local elite didn't keep detailed records doesn't mean they didn't happen.

In parallel, major slave revolts in continental North America also happened about once every generation (it's hard to compare to peasant revolts because the historical record is better). Surely that isn't evidence that the slave population didn't express (or desire to express) complaints about inequality when they weren't engaged in armed uprisings.