The currently existing classes have never been in a worse state than they are since Legion and BFA, with an abundance of problems including: spec fantasy was prioritized over existing class fantasy, ability pruning has compressed skill gaps and made gameplay stale and one dimensional, tuning problems exist in both PvE and PvP.
Therefore it should be a bigger priority of the development team to fix the existing 36 specs and ensure that every single one of them is fun to play, mechanically interesting, feels connected to the greater class first with the specialization being more secondary, and well tuned for PvE and PvP content, BEFORE introducing any new specs or classes into the game.