It might not actually provide any benefit at all - it's entirely possible that ME/PSP are simply included because it's slightly easier/cheaper for Intel/AMD to

It might not actually provide any benefit at all - it's entirely possible that ME/PSP are simply included because it's slightly easier/cheaper for Intel/AMD to design and ship a single unit than two separate units, or a single software configuration on that silicon instead of two different configurations - just like how they'll fab a single piece of silicon and then selectively disable pieces of some chips and sell those as lower-performance parts. Obviously, that doesn't make any sense to a consumer - but that's the logic that the manufactures might be following.