I agree. The journey Sophia is on is not exclusively hers - she is A Wife and Mother.
Her interactions with Liam (what few there are) help define her as a wife (and give her reasons to begin to appreciate affection from other people since Liam can hardly be bothered).
Her interactions with Ellie and Dylan help define her as a mother.
I don't see the need to Sophia to be in Every scene, but I would expect to see one or more of the Parkers in every scene.
I was fine with Sophia leaving to go to the art class and Liam and Cathy had an erotic moment when Cathy was trying on her wedding dress and Liam could watch or not - his choice.
I'm fine with Ellie and Dylan both being at the same event, regardless of how far they actually go on this PD.
I would like to see more of Sophia's introspection about what is happening around her, in particular with Ellie and Dylan.
I'm hoping that Sophia will overhear some of what goes on in the final event of this PD and that it will help to shape her future interactions with Ellie and Dylan.
Part of her journey is accepting that her children are becoming sexual beings and eavesdropping on this kind of conversation can help her to see both Ellie and Dylan in this light as well as prompt thoughts about intimate times she has spent/might spend with each of them.
So - reality check - Time...
I see the major issue with any scene L&P creates as the amount of time it takes versus how it advances the story.
Is this scene the fulcrum on which the Ellie/Dylan relationship turns?
Development plays out SO slowly that I don't know whether or not this choice - who Dylan spends the evening with - is the final 'either/or' for Dylan/Sophia and Dylan/Ellie.
If it is and Dylan chooses to go to Christine's party, is this the equivalent of sending Dylan to boarding school (he no longer has much activity, in the way of content, with Sophia?
I understand those who want only/almost only Sophia based events given how Very Slow development is.
I simply don't see L&P changing course and pushing Ellie and Dylan to the periphery such that one or both can only be present if included in a scene with Sophia.
Cheers!!