I don't know if this made it the best app, but joey had this arrow up button on every comment. It will collapse all previous sibling comment so you can easily see the parent comments and find the context.
For example when you tap the up arrow on comment G this is what happens:
- A collapsed
- B
- C collapsed
- D
- E collapsed
- F collapsed
- G
As you can see it preserve the comment chain and quickly remind you of the context. This is extremely useful on a busy thread. I haven't seen this feature on any other reddit apps. I wish lemmy apps could adopt this feature