I'm not a teacher, and my kids have not (yet) sat any of these tests.
But in principle, perhaps a test that is not so curriculum dependent is a good thing? I mean, applicants already have the top grades so you would have to rely on that for the subject knowledge at institutions such as Oxford.
But if admissions then want to admit the true talent from that pool, then a test that does not rely on 'learnt' material to the same extent as perhaps the PAT (from reading on here), is presumably a good thing?
Nowadays, it is much easier to 'teach to the test' than ever before. As I've mentioned before, some of the students I've seen going to Oxford are 'perfect 9/A*' student but honestly - and work very, very hard - but some of them are not what I always thought of as Oxford 'standard' - i.e. the real novel thinkers with depth.
Didn't know that the PAT was actually written by the Physics department at Oxford! Who would actually be involved with writing these questions and how do we know they're not leaked?