As the title says. This is a rather esoteric issue, but cabinets having their own unique code (instead of extending barrels) prevents them from being used as containers on Create contraptions, as well as being used by Botania's Corporea network. I'm not sure how trivial or difficult such a change would be, but making cabinets extend barrels would be extremely helpful.

i think actual issue is that they dont provider item handler capability. In 1.21 one needs to manually register those as they are not gotten through inheritancy. extending wout both be incorrect, as cabinets are not barrel, nor solve the issue