On the other hand: I can very well imagine some senior staff rolling eyes but feeling unfree to 'spoil the mood' by explaining how certain choices are going to come back and create problems later on.

I find it superinteresting, but also superhard to have that sort of feedback as things are ongoing. I've seen both happen (old hats hating progress too), but I was never successful (not in those larger above-my-paygrade-but-visible-nonetheless) in having a conversation about how we're having the discussion and whether or not every point/everyone is seriously hearda and considered. There can be a 'mood' that is overriding, and I haven't found a way to override the mood. Things tend to have to break down before that can happen.