The reasoning (to my understanding) that it is that it's more complicated than that. Each system or subsection of the database has it's own specific console ID so each section can be implemented into the submission scripts and search functions.
If you've got a system that needs it's own secton just PM one of the admins or post it here. Try to make sure that you account for any variations and re-branding in the title. For example:
FM Towns/Marty/Marty 2 because all three versions of the FM Towns will be in the same section and have the same games for the most part. Also try to list the regions that need to be enabled for the database as well, in this case being
Japan. Also if your unsure just ask, some systems may not be significant enough to warrant their own section but in this case the FM Towns certainly is.
Always feel welcome to voice your ideas and suggestions as well. This site is built and maintained by both it's members as well as staff and both are instrumental in it's growth.