Resto shamans desperately need a “tank cool down” so that we can be anything other than trash tier for pushing mythics. We will continuously get declined from groups until this happens, as evidence from the past 2 expansions. Every other healer has some sort of tank cool down: holy priest has guardian spirit, disc has pain sup, Druid has iron bark, monk has life cocoon, and pally has sacrifice.
My suggestion would be the new “Surge of Earth” talent that was added to be changed. Shamans are super saturated on AoE healing, thus yet another ability that does the same thing is not needed at all. I think a good compromise would be to change the talent to something like “The target with earth shield takes 20% less damage for 10 seconds. Earth shield will not consume charges while triggered while active. 1.5 minute cool down.” Or something to that effect. Not a super OP ability with an average effect and long-ish cooldown compared the other healer counterparts spells, but it just gives something that can help for 5 man situations.