This is really complicated because “Casual” grade is kind of a load-bearing part of the current labelling system and it would take a lot of work to untangle that.
The staff evidently have some (understandable) concerns about the work that would be involved in doing that untangling:
(I’m not entirely clear on what the difference is between those two feature requests and why Tony closed one and not the other)
(Edit: oh, it’s because the latter feature request wanted to make RG obs be Needs ID too, to encourage subspecies IDs, which I agree is excessive. The part applying to Casual obs is relevant here though.)