I think that policy would be a poor reason to choose a subject.
People should do what they enjoy. There is certainly no requirement for Physics/Maths, or indeed for a contrasting subject either.
Of course, no decision should be based solely on any policy, and the ultimate reason to choose a subject must be enjoyment. Nevertheless, for someone who is unsure of what to do and looking for ideas, looking at what universities have to say might add another dimension to that decision.