As far as I remember, the episode at the beach (and eventually gym before) was part of the troubled youth path, and Zorlun had also said that either through that, or through the prison (I remember troubled youth, but I may be wrong), Myriam could get again "in touch" with the young fellows who had attacked hobo ( and had promised revenge).I'm so sad that my boy Aiden is not going to have a full story after all.
I grew fond of him since the very first moment he was introduced and I've been eagerly awaiting news of at the very least some new scenes with him
Same for the whole troubled youth route, which if my memory serves me right.. it's also not going to happen, feel free to correct me on this one though if I'm wrong, as I haven't been around for a while and things could've changed since the last time
I am not sure if they were completely eliminated, or just postponed due to the quantity of paths possible. In any case, as far as I understood it, those were never meant as "main paths", meaning, with their own ending, but rather as kind of "quests"/deviations the player could make her do to add (or not) some spice and set the stage (variables values) for other things.