I think the problem is that the categorization is kinda broken.
Quite some time ago someone created a categorization about what a nut, vegetable or fruit is. Back then the knowledge about certain types of them was not that good so some things got into the wrong category. (Like people considered Strawberries fruits). But, today, instead of fixing those categorizations we put those species into groups they don't make sense at all.

Since often species which are very alike biologically often get into very different categories just because someone told us to a time ago.

Would be like categorizing pugs as apes because they are able to walk on two feet (at least while they're peeing).