This post by Pat S. provides some insight into this: If memory serves me correctly, the current way of game searching came to
being due to originally there not being a standard method. At one time,
everyone could list their game however they wanted to but that lead to
having no reliable search method at all. I remember that at it's worse,
there was over 15 different ways that one system was listed. Now think
about how many systems are out there and how many different ways you can
label or tag them. Due to the community's outcry of "We want it more
standardized so we can search easier" at that time, the Devs sat down
and reviewed the data on the games being played and the most common
method of games being listed/tagged/titled. This was the result of it.
Over time more games are added as they gain popularity and they become
in demand. Right now, it is recommended to list those "x small
systems" be listed as other but with their system in their title and
game description. The search engine usually can find them that way. Once
those systems hit a specific percent of demand and use they get
reviewed and added usually.
