Ratchet could be a plot point for the next movie. From what we saw, his spark survived and is presumably on the ship. Rescue, maybe? (I hope.) I'm seeing some of that in fanfiction already.
It was a bummer that we didn't see the dinobots until near the end, but to say they weren't sentient is totally incorrect. They were alive and aware and understood Optimus when he released them from the ship. And, once OP showed Grim who was boss, they followed his instructions. They might not have been equipped with vocalizers that were able to form English words, and as far as we know, they could have been communicating with comms.
That's why I wanted to see a paperback version of the movie. Previous movie books did have some insights and explained things a little more. For me, anyway.
But, I missed so much the first time though, I really should try to find time to see it again.
And take notes.