This site uses many categories to help users find related articles that may be of interest. Some old list type pages are now categories, for example the page on 64-bit games became so large it was unwieldy. Some are categories include blog posts in video card drivers which can often present problems for users.
Some new ideas for hardware have been considered for motherboards etc. Most boards have PCI Express slots now, and most still have PCI slots however memory type and CPU socket has changed more frequently. The database can be leveraged more deeply but this may be more useful with feature lists etc.
At present the categories are easier for Google etc to find particular reviews from the site.