Exactly, that's why we should try one substantial change at a time, so we can actually understand the effects before pulling out the hammer yet again.

With essentially every proposed hard fork so far (at least those implementing rule changes), the feedback from the stakeholders and community has strongly favored fewer changes being pushed out together as one big package. Sometimes that is impossible or impractical, but here we have a case where there are two completely independent major rule changes (flattening the reward curve and splitting the pool) that can easily be rolled out, voted on, and evaluated separately. I see no good reason not do so.