Another gentleman of Austen's , in Northanger Abbey where he declares:
"I consider a country–dance as an emblem of marriage. Fidelity and complaisance are the principal duties of both; and those men who do not choose to dance or marry ..."
What do you think? A man who is inclined to dance, to mingle with the ladies, makes himself available and is perhaps more likely to fall in love?
Not that it is always a prerequisite as the groupreaders have daily proof ;-9
But whatever Darcy's genuin feelings about dancing, he would have learnt to stay away from it. He'd not willingly place himself in the hands of husband hunters.