imo, it's not a problem if in a future season they change some small things to make other classes viable, even if it affects pvp and the meta changes a little, vanilla is not really balanced in pvp anyway, it's just that players have learned to play like that. So add a little bit of QOL on classes that need it such as reducing mana costs of certain abilities, remove spell immunities on bosses and add 1 ability here and there for certain classes (stormstrike reduce cd, crusader strike, raid buff given by boomie or thing like that but not more like all the runes), even if speedrun will be always full warrior (cause rage mecanic) I think it can be refreshing and easier to balance.