Again, you're making assumptions. There's no way to know whether someone has to tools or not to make adjustments to major league pitching until they face major league pitching. And while AAA isn't a significant jump in talent, it does have some developmental value. The level of competition does increase slightly. When Cherington said it was a "warming" stage, he didn't say it had no value.
I was using your criteria for someone who had the tools to adjust to major league pitching.
Lars Anderson had an OPS over .900 in AA as a 20 year old. And Lars Anderson is only one of many examples of hitters who adjusted to AA and weren't able to adjust to major league pitching. Not every Red Sox prospect to come through the system is a sure thing just because they hit well in AA, even if they're as highly regarded as Bogaerts. They're called prospects for a reason.