This is not exponential growth unless you turn off Growth Required Scaling.
Your nominal growth is linear with the number of pops, and dp/dt=kp would indeed be exponential. But you don't get your nominal growth: growth required scaling multiplies everything by a term that's inversely proportional to p, so it goes back to just do/fp=k, which is linear.
It is better than everyone else that gets dp/dt=k/p, which gives p=O(sqrt(t)) with default mechanics.
But machine/robot Hedonists aren't the only thing that does this: Budding and Polymelic follow exactly the same pattern.
Hyper Lubrication is the problem here, not the Hedonists.
Hedonists are just Budding and Polymelic that require you to waste your pops on bad jobs instead of real jobs in exchange for a higher base value.
Hyper Lubrication is what kicks growth into overdrive. The Hedonists just delay the slowdown substantially.
Twas always thus, aside from the Behemoth thing.The timeline has just moved up by a bit.
Virtual is a power spike build, so the earlier you get it in any given patch, the more powerful it is.