For years, people complained that UK airports in economically struggling regions were not linked to the UK's main hub airport and thus found it harder to attract trade. This was even one of those "after Brexit this will be solved" claims.
DND and LDY have now got what they needed. It seems unreasonable for STN fanboys to complain that the regions get what they really need.
Disclaimer - I've flown to or from STN over 300 times, far more than any other airport - I am not anti-STN.