I only dip in and out but I don't really get this notion of focusing each episode on one group at a time. Game of Thrones's stories are split all over but they don't tend to focus on one group exclusively unless there's going to be a good dramatic payoff.
Otherwise they split up their stories so that they can try to make sure each episode has a hunk of good drama. It doesn't always work but comparing last week to this week it just felt like such an odd choice. If you'd intermingled those episodes' stories then each episode could have balanced these elements without it seeming so weird.
I feel like 'bottle episodes' or whatever fancy term they have should be a rare sort of thing, for a specific dramatic purpose.