To add some more detail:

I would really like a Read More link at the bottom of each pinned post or shortened posts. Right now, I have to resort to writing something like "Long post. Please click to read on mobile." and bolding it. This is a really small change that would add a lot more usability to the platform and save me a lot of time repeating info and tagging users.

The ellipsis (...) or word cut off is not enough to signal to the user that a. there's more content and b. they must click generally anywhere on the post to open it. Sometimes, there isn't even an ellipsis and the post cuts off at the end of a sentence, so people have no idea at all it's a longer post.

Agree. It's confusing when the option isn't presented, so members know there is more to read. People assume they've read the full post when they haven't. Similarly, there's no "Back" button when they do discover there is more to the post, also causing confusion.

Agreed.

Yes, this has been missing for quite some time. Hope it's done soon.