I responded to the two proposals on their talk pages.
I agree that the user experience of the proposal process leaves much to be desired. However I don’t think that migrating the proposal process to Discourse is a good idea. Discussions here cannot be structured as well as discussions on wiki talk pages can be. Discourse’s voting system doesn’t allow you to add a comment to your vote, which is very much essential to the proposal process and as @Mateusz_Konieczny has said on the respective mailing list thread: having the voting on a different page than the proposal is certainly not a good idea.
I still think that it’s very good that you’re pushing for better UX and less barriers. I think we can all agree on both being very much important … so we should certainly work on improving the UX and removing such barriers. I just don’t think that simply migrating the process to Discourse would yield any net benefit.