Matchups are also a part of skill. If you can keep your Mega Lucario/Heatran/whatever other counter to the opponents you have from going out until the right moment, then you should get rewarded for being able to do so. Making good orders would also help with preserving your ideal pokemon.
Also, Earthquake will probably be a very common move if we do doubles because it strikes almost every steel-type for SE damage (Ferrothorn, Skarmory, Forretress, Scizor, Escavalier, Durant, Genesect, Wormadam-T, and Bronzong are all the FE pokemon that are not hit for SE damage by EQ and are steel-type).
Also, Doubles matches eat up twice as much of your time, both for refs and battlers, if you want to keep the same level of quality in your orders, so that is another reason why I won't want Doubles (I already have a busy schedule now).