That's a very un-Apple idea. Their philosophy is that the user shouldn't have to think about things like thermals. You buy the system that can handle your workload. They don't want you buying the cheap option and hot rodding it.
Maybe this makes more sense in 2026 with the focus on local AI models, but I think Apple would prefer to sell high end desktops AND high end laptops to people who want both portability and maximum performance.