I wouldn't say "dumb" since the plan is clearly to get people moving over to Warmerise's official Discord server and stay there, possibly getting rid of the forum and website altogether in the future. (I mean... this place is quite dilapidated anyway).
If at all, it just doesn't make much sense? Unless... the motif is just to let players connect their existing Warmerise account to their Discord account for data migration reasons.
Never had discord, don't really ever intend to sign upp for something I don't use. Seems like an un asked for feature that doesn't mesh well witht the guest feature in game. Not broke dont fix it kind of thing. I'm just waiting til they change it back to play, and I hopee they do