Maybe, my issue with Discord is that it becomes hard to follow and find topics. Also, because of that, I would need moderators and such that read all the chat, because people tends to write much more and go off topic. Therefore it will take lot of time away from developing to go through all the writing. It might be not an issue at this stage, but it could be in the future.
I could use maybe partially Discord for some features and leave the rest here.
The poll issue however remains, people needs not only to register on Discord, but also to be a member of that channel just to be able to vote.