Doesn’t it depend on what you are a professional at as to whether you use two monitors or not? There are lots and lots of different types of professional.
Apple do different types of professional machine to cater for those different types of professional.
Some are low end, ram and port limited, but cheap, small and fast.
Others are higher end without the same restrictions but with other caveats.
It’s really depends on what you want, and as a professional and not a general consumer, you’re more than likely to know what you need and therefore choose accordingly.
Apple has had their MacBook pro line up split in to two tiers like this for years and years, but they just started transitioning its line up to a new architecture, so it’s no surprise to find that they haven’t converted all of their machines to it yet.