Agreed @Bastien_Siebman, it would be nice to know for sure.
They’ve mentioned in the past that the relationship between subtasks and parent tasks is something they’re planning to tackle in the future (though it seems like they’ve been at it for a while), so I’m hoping that’s an indication that it’s not a case of them sticking to their initial design decision and more to do with the fact that it would be a major undertaking to completely overhaul the way their architecture works.
Hi @Julia_Forbes, we continue working on improving times, in fact we made shipped some very recently (see Timeline Show - Hide Sections, Tasks, Subtasks Sidebar Option , We’re replacing the current task pane on Timeline with a slide in task pane! and Section Dividers in Timeline )
We’re aware subtasks on timeline are a popular request, we recently implemented them in Lists and Board project (see You can now see and action subtasks directly from your Project task list! and Subtasks in Board View ) so I’m confident we will implement them into other views like Timeline. I’ll make sure to keep you posted in the Forum as soon as I have an update on this topic!