The leveling process is all over the map with tanks. But its so short lived and temporary I wouldn't worry about it much. War will become much stronger at lv 70 for dungeons when inner release allows you to spam 5+ steel cyclones with guaranteed crit/DH and kill packs easily while gaining boatloads of health to the point of invulnerability every 90 seconds. 60-69 you wont have that in your pocket while Drk will have all of their mass pull tools available. War used to have 20 second zerk+Bloodbath at an extraordinarily low level to mass pull, but that is all gone now leaving mass pull warrior a little behind until that function is returned in another form (steel cyclone inner release spam) at 70. Similarly Drk doesn't get TBN until 70 making it suffer from tank buster actions much more than the readily available inner beast war has while leveling.

Without your full kit at 70 there will be gaps for every tank until it all comes together. As SE has changed, removed, added abilities to all tanks over the years and expansions the leveling process has gotten a little wonky. But its really a very short lived annoyance as the game settles in at 70, and at that point all tanks have what they need to get the job done.