Genuinely, though, for the vast majority of universities- to the extent they look at GCSEs at all- they look at grades achieved over subjects taken, and I think it is disingenuous to suggest that one softer subject at GCSE with a high grade in it will have any impact at all on someone's university application.
Not taking certain GCSEs can obviously close certain doors, but taking one, especially as one of 10 or 11 subjects is very unlikely to.
Realistically, most students who will chose 10 GCSE options this year will probably have room for maybe 2 softer subjects at a push. Also, a student is far more likely to not have a shot at a top university based on grades achieved rather than subjects taken at GCSE level.
As I understand it, a lot of universities (even Russel Group universities) just aren't that interested in the GCSEs you've taken.
It's silly to talk about facilitating subjects at GCSE, and it's worth remembering that lots of applicants get into top universities, having NOT taken 3 facilitating subjects at A-level. Unless it's written on the university or UCAS website, it's not a hard entry requirement, and shouldn't be treated as such.