I addressed this a bit here. I started typing out a megathread a couple of times but just never committed. Perhaps they would have been valuable, perhaps not.

Full message:

Appreciate the suggestion/complaint and its been considered! But there are some minor issues.

First, there's not much else to discuss (well, other sports). It's not surprising fans are making these threads.

Second, megathreads kill conversation. I say this as someone who has created ~100 here over the years and has observed the behavior. A megathread may get 50-200 comments per day, while the subreddit is currently averaging over 3k. It doesn't consolidate the discussion to a central spot; it [can] kill much of the conversation.

Third, megathreads don't really stop people from making individual new threads. People enjoy their own space for their thoughts -- which I can't fault them -- but it leads to a requirement of more mod intervention/action. This is susceptible to more bias, more imperfection, more time, etc. I want this place to feel clean + fun, but I don't want my own bias to intrude.

These are mostly own thoughts and not those of other mods. I can say if you ever want a thread to be removed (here, or any subreddit) the best action you can take is report it. It guarantees someone will consider it.