Do you want combined science to a relatively low level of sophistication because the overall aim is to prepare the citizens of tomorrow such that they have enough of a nodding acquaintance with science that they don't fall prey to anti vax conspiracies or climate change denialists?
Or do we want in depth single subject sciences to prepare the scientists, engineers, medics, HCPs of tomorrow?
Conversely, is it better to go into depth in a couple of science subjects and not cover anything in the third? Most people will tell you that students who took sciences at A level after only doing double science had a little catching up to do, but still managed to do as well as their triple science peers in the end, so I’m not sure your argument holds water.
DD took her GCSEs before the reforms, and she did triple science. The difference was that the double science students did papers 1 and 2, and the triple science students also did paper 3. Doing triple science took up an option at her school, which IMO was the sensible approach.
or whether they are using it as a way to cover PSHE etc issues & get a GCSE in say 2hrs/fortnight.
Which is how DD’s school approached it. She certainly didn’t spend 5 hours a fortnight on Citizenship.