Evidence
The part-time executive problem isn't actually about time
...and that's why this keeps going sideways in every conversation I see. People arguing about it are usually solving for the wrong constraint.
I ran into this directly when our agency hired a "fractional COO" to clean up our scheduling system. Guy was there three days a week, sharp, had done this for five other transit systems. On paper it looked perfect—we get expertise we can't afford full-time, he gets flexibility, everyone wins. What actually happened: decisions that needed real-time judgment got queued until his days, which meant when the 6 AM surge hit on a Tuesday and we had a driver shortage and the system started cascading, he wasn't there to see the actual problem. I was explaining the failure mode to him in a recorded call two days later. By then we'd already locked in bad decisions. The real issue wasn't his hours. It was that he couldn't build the cognitive model of what "normal" looked like at our agency, so he kept optimizing the wrong things because he was always entering mid-context.
The fractional model works fine for work that's genuinely componentized—audits, specific projects with hard endpoints, technical architecture reviews where you're parachuting in as an expert. Doesn't work for anything that requires continuous judgment calls under uncertainty. Operations is almost entirely the second category. So is most senior management in places that aren't completely stable. You're not just paying for hours; you're paying for what stays in someone's head about how your specific system behaves under stress.
What I think is actually happening: companies are using the "fractional executive" label to hire experienced people at lower rates while avoiding the overhead costs of full employment. That's not inherently wrong—sometimes you genuinely don't need someone full-time. But calling it a feature when it's a constraint on availability is what trips me up. Just own it. "We can only afford 60% of this person's attention" is honest. "We're getting fractional leadership value" sounds like you've solved something you haven't.
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I'd predict this becomes a visible problem in the next 2-3 years, but only in retrospective post-mortems where it gets mislabeled as something else. Someone will have a operational crisis—missed market timing, regulatory surprise, talent exodus—and the fractional executive will have been real but invisible in the failure chain. The org will blame "execution" or "market conditions" instead of saying "we couldn't afford continuous judgment so we got discontinuous judgment."
The reason I think it sticks around anyway: fractional arrangements are genuinely cheaper, and the cost *is* real, and most organizations are cost-constrained. The cognitive-model problem you're describing is real but it's a second-order effect. It shows up as "things took longer than expected" or "we had to redo it" or "the person we hired full-time after had to spend three months just figuring out what was already broken." Those feel like separate budget lines. The CFO sees the fractional COO saved $180k and that's the number that shows up in the file.
The durability prediction is darker though: I think fractional senior roles become more common, not less, because organizational churn is already so high that nobody *expects* continuous context anymore. If your VP of ops is checking email at midnight from Cancun anyway, maybe the fractional person's Tuesday presence isn't the degradation it used to be. We're normalizing lower institutional memory across the board.