fwiw this was also true when TBC first came out, you absolutely needed a tank because trash mobs hit for ridiculously hard amounts. It slowly got nerfed, and the real power of 5x shamans came around when you were able to get s1/s2 PVP gear for honor, it had loads of resil/stam/damage and was the turning point, plus tons and tons of good badge gear trickled out. Over a year after the expansion was released though. So I'm sure over time it will be do-able, just not now.