I assume you're talking about dry bowl blanks 10/4 to 12/4 in thickness. I have no science to quote, but I suspect your correct, Odie. Acclimation is theoretically beneficial, but as a practical matter the benefit may not be very significant.
The question depends very much on what you're doing. If you're making furniture and resawing an 8/4 board down to 3/4, then you need to produce flat, stable boards, which you are going to join together. And at 3/4 thickness there is going to be some moisture exchange that will happen over days or a week. If you receive a 10/4 or 12/4 bowl blank, dry and unwaxed, it may acclimate in a few days, too. But if it's dry and waxed it's going to be on a months time scale. And if the wood is wet it's certainly not going to "acclimate".
And just the same, I'm not sure how much movement you're gonna see over the length of a 10 inch blank as compared to 10 foot board. Particularly since the bowl blank is not going to be joined, but rather continuously "milled" until the final form is achieved.