Aletta is pretty popular (so are Emma, Cassidy and Palla), the reason those 4 girls don't get much content those days is that their writer has some IRL stuff preventing him to work on them.
As for the patreon polls:
For November they choose Harmony and the update has content for Harmony (30%), Sasha (15%), Samantha (40%) and Bree (15%). So as you can see they have a say in the content but the updtae is not limited to what they chose.
And I am focusing o the oldest girls first and foremost to complete them, that's why they have WAY mor content than the new ones.