I am neutral mainly because I like movements to help keep things fresh and up to date but the forums are nice and simple but most importantly, not noisy like discord.
I had a great deal of difficulty parsing your response. Mostly because of language constructs like the above.

Usually "but" introduces a new and opposite point, so a double "but" sentence seems to negate itself?
Honestly I think it is still a good idea but maybe not make it impossible to reply to forums stuff as this is the forums so a hybrid of such a decision (this is real life after all, life doesn't give you integers so why use integers?), a place of Knuckle Cracker and information of it, discord is a chat rather a place of complete information.
Discord is transitioning and evolving. So are we. We want to be where the player audience are. In our estimation, that is Discord, and will be so increasingly in the future.
We also felt that it presents difficulties if the same thread (discussion for a specific map) is in multiple places. Not everyone would follow both sites and some information may be not seen or may be in multiple places - neither is desirable. As transitioning mechanism, we are still placing an entry here, but we link to where we believe the primary venue should be..
Like I still don't know how to place images here but uploading a screenshot (without it just being a download) on discord inside a topic of a map? Should be very quick and easy. This can enhance the flow of information between all participants which can be immensely useful.
You are correct in the ease-of-use observation regarding Discord. For uploading images in these (the SMF forums), you should host the image somewhere such as imgur.com and then use the image tags (there is a button in the post editor bar) to mark the image. There is plenty of help on Google if you need to figure it out.
Also well done in getting me onto your discord.
Well, if you are there, drop in somewhere and say "hi" - I'm sure many folks who played your maps might be keen to talk to you about them.
I can't put downloads at the wiki (as far as I know)
I believe we made a conscious decision NOT to host CPACKS on the wiki. Some folks create their own GitHub repositories to host their CPACKs. When you're on Discord, ask Grabz, for instance. You could simply drag and drop the CPACKs onto a post in the relevant map thread, or you don't have to do either and folks can grab them from the most current map by opening that in the editor. In my opinion, GitHub is a good repository for material like that.