It would yes, but my argument is this. Anyone who has a modern ("AAA" gaming machine) has probably paid a fair chunk of money for it. For a high end one, maybe $2-3k. Now consider how much of that money went into the last 10-15% performance of the machine. There are significant diminishing returns. It's for example the difference between a mid-range i5/i7 and the highest end i9 on the CPU end, or the difference between a 1660ti and a 2070 on the graphics card side. It's often several hundred dollars that went into the last 10%.
So: even if I built that machine to not be exclusively used for gaming (which would be an outlier), anyone who has a machine of that kind could easily motivate making it exclusive for gaming, because there is so much money in that 10-15% that we can buy a second much cheaper machine (e.g. a low end laptop, chromebook etc) to use for other things.
an outlier, but not a unicorn. Dedicated machines running RetroPie for gaming is very much a thing. Probably most people doing this use a RPi (so not Intel), there's a lot of us buying old OptiPlexes and stuff.
People running RetroPie are unicorns of unicorns in terms of the people using computers. Hell even people gaming are unicorns in terms of overall computer usage.
