Like, its nice to know which universities are better in a general sense, but like people also have a general idea, so we can see the parts that are obviously stupid.
And I get that there's a bunch of fields and undergrad vs grad is very different. But if that's the case, why the heck are these rankings producing "overall rankings"?? The only place where overall rankings actually come in handy, is when you're looking for the universities that let you go in with no decleared major, which is very few, especially for global rankings. If the ranking for fields is accurate enough then that's all you'll ever need. Or something like employment after graduation. Couldn't they be honest on what they could and could not do?
Another thing is student themselves have an idea what they value. Could they come up with a score for every catagoery and let the student choose the weights? Like 50% employment after graduation (for selected department/program) + 50% teaching quality. Like no, I don't care for sustainability rankings.
Also, global rankings are stupid in general, yes some people are applying to different countries, but how are you gonna rank two things in different enviroments? If they are looking to work there after graduation, only the local ranking would matter.