Well, teacher- I think it all depends on whether Boos is looking at your DC's results as s/he appears to be basing it on their own experience (amazing, apparently) rather than 'what the DC might require to do well in future'.
However, I don't think boos is the Admissions Officer at the outstanding 6th form DS hopes to attend so I shall continue to push for him to do well in triple science, rather than double, as I know, from direct enquiry, that a bit of music and some history isn't considered the equivalent of good score in that individual science when it comes to that DC being admitted into that science A level as they value the opinion of the (many outstanding) secondaries, and don't rely on boos opinion, therefore, if a DC wants to do a science A level but has done double award in a school that offers triple they do this:
and wonder why..
And I have to say this whole 'question whether the university was the right place for my child' thing seems a bit precious since was are now talking about adults, themselves. Like, one might say, "never will my precious offspring darken your doors because that university dare wonder whether that arts GCSE was taken in place of an extra science GCSE because my DC wasn't capable of passing that extra GCSE! Obviously they would have passed that third science with flying colours but we chose to broaden their GCSE results with some- er- music, or whatever".
How very dare they! But your DC may not get that place, awarded, as it was, to a triple candidate with good results.