There's no good way to use Slack threads
Everyone thinks Slack threads are awesome, but in reality just put a band-aid on the problem of Information Stability. They slow down communication when it starts to get too hectic (Same for emoji reactions) but they don't solve the core issue.
These are part of the Slack features to slow down information loss.
I think Zulip's website has a good walk-through of why they are a problem:
Backlinks: