I have to agree with aevan here: high-performance is kind of open-end. Where do we put a limit? Some of the things I do need hundreds of cores and multiple terabytes of RAM. From that perspective, any laptop and in fact, any desktop on the market are a child's toy.
The fact is that the MBP makes probably an optimal compromise given what hardware is available on the market. It offers fastest available CPUs suitable for that chassis and a very competent GPU that is absolutely adequate for content creation or other work — provided the software can utilise the hardware competently. Of course there are people who need more RAM or a faster GPU (in the end, complains about MBP's performance boil down to "I want a faster GPU", but so far I didn't really got a good explanation WHY they need it). But the fact is also that people with those needs should really look into desktop workstations. For instance, you'd need a dual-processor machine with four memory channels to properly take advantage of 32GB or more RAM.