I think if we could do more with sub-categories this would help. Anything we can do with a main category, it would be nice to do with a sub-category. Filters, schedules, etc. Yes, you can get around some of this with filter rules and schedule filters, but the main thing that I see a benefit from would be applying parameters.
Say for mechanical equipment. This is an extremely broad main category (I'm sure there are many others as well). There are so many things that fall under this umbrella. Sure, we can make many sub-categories, but this is only useful for hiding things in a view or overriding those specific subs. That isn't much. I'd like to be able to filter by a sub-category, or make a schedule that is specific to just ONE sub-category. And better yet, I want to be able to apply project parameters to a sub-category.
If this was possible we'd be able to eliminate many of the issues with swapping out content from one manufacturer to another mid-project. The only thing we'd really have to do is make sure that that content was on OUR specific sub category.
I'm sure there are some implications that I'm thinking of that wouldn't work, but it seems like it would be a nice addition. Any thoughts?