Not set in stone, but this is the draft we're working with. I think those concerns should be raised again, and we'll see where it goes.
I think the logic of switching to Beleriand just then is based on the idea that 'nothing much happens' while the Noldor are making their way north up the coast of Aman. And so, it's a good point to cut away and just rejoin them later without any time spent on that journey - just a quick check-in in Episode 4.
But I do agree that we want the Sea-crossing to take time, so we should spend some time with the host of Fëanor on the boats, not just have them leave and *poof* arrive. Maedhros is going to stand up to his father when they land, so it seems to me there should be some build up to that, with the different brothers on different ships having a different view of what is happening, and whoever is on Fëanor's ship maybe noticing the guy is heading closer to crazy-town.
Haakon, I like your suggestions, and am hoping to add some Dunedain to Estel's encounters outside of Rivendell. Maybe instead of dwarves? Meeting humans would be a 'cultural event' that could be analogous to the Sindar meeting the dwarves, and the foreign-ness of it would drive home Gilraen's point that she didn't want her son raised as an elf. Estel has seen Men before, of course, but as visitors to Rivendell. Seeing them in their own home rather than as guests would be new to him.
Of course, there's reason to have dwarves on the road between the Blue Mountains and the Lonely Mountain, so...we can have dwarves, too, if we want them. Recall that Estel met Bilbo (and the dwarves) in Season 1.