Mushroom is either OP, or completely useless depending on the situation... and this is VERY BAD.
If everyone is stacked, and there is a big damage happening every 20-40sec, then Mushroom is brokenly OP, it will cap very fast with the pre-hots for raid damage, and will heal for huge amounts because of critical his and mastery, plus the 10% new passive, becoming the most mana efficient and powerful healing spell...
The problem is that 95% of the time this will NEVER happen in this raid... i tried the Raid Finder fights on PTR, and none seemed possible to use Mushrooms without a HUGE group work for the entire raid, and even then you would hardly be able to stack at the same point you were 30 sec before, so mushrooms lose their value and became a waste of 3 GCD.
It forces you on a play style of high amount of Reju overhealing, but punish you heavily if you fail to use the mushroom.
Either you play like 5.1, and mushrooms will be useless, because it takes too much effort to predict were everyone will be, plus 3 GCD`s, plus fight mechanics that will prevent people staking there or even stacking, or forcing to leave the stacking area, that it becomes useless.
The amount of heal is INSANE, the rate that they fill up is amazingly good, neither the HPS or the HP/M are the problem here... but the small area, time to ramp up, clunk placement mechanic, and the inability to move then without losing the healing stored.
My suggestion would be that placing a mushroom and making an old one disappear will transfer the amount on the old mushroom to the new one.
Hell, even if only half of the amount is transferred it will make this much better.
A better solution would be lower the cap to 1/2 of your HP, make the GCD 1,5sec, and make it only 1 big mushroom with maybe 30% bigger radius, and spawning a new one pass half of the stored amount from the old to the new.
This would make then really useful, and complete our toolkit nicely.
With the huge revamps to Disc Priest, i'm really expecting something bigger done to us, because we NEED it badly, we are in way worse shape then Disc Priests and our toolkit is way more flawed right now.
We still have alot of mana problems, and the Reju reduction alone will not solve it.
Either improve our toolkit, or the druid overall QoL problems, or we will never be comparable to healers like Paladins.
Like i posted in the past, the -9% reduction to rejuvenation would make wonders if coupled with a change to mushroom, but a usable one not an OP/UP depending on situation, and with a change to make clearcasting stacking to 2 or 3. ( Sure the baseline 10% more healing is great, i know that, but the mana problems still stands... )
Right now they are giving us a change to WM:B that will be completly overpowered in a stacked fight were the group stay stacked at the same spot for longer then 40sec, and useless on the rest.
This is the worst possible outcome, because it will make us OP on certain possible boss mechanics, and completely weak on the rest. People will bring us to those bosses, and force boomkin on druids for the rest!
I noticed that Monks and Paladins were dominating the healing charts on PTR, but that was only Raid Finder, so i still dont know about real raids, but i believe we will stay weaker if nothing is done.
I`d like to remember that blizzzard is changing Mastery and Critical for Disc, because they would pick one and scrap the other on previous designs, but Druids do the same to haste, its a completely worthless stats for us outside of specific caps, but the 3043 cap (with raid buffs) is the only one that worths it right now, because the amount of haste to reach the next cap is so big that this amount invested in mastery, or even crit makes more HPS.
So if you are trying to balance stats, plz do something about our crits and haste, right now mastery is the only descent secondary for druids... besides HUGES, and i really mean HUGES amounts of Spirit.
There is no "you can use a piece without spirit..." for druids, we gem full Spirit, and yet we fail to stand toe to toe in mana management against healers that are gemming throughput stats.
And no... clearcasting without stacks are not good mana management tool, because most of real damage nowdays is AOE, gaining single target, low HP/M spell for free is not really that great...
Its good, we use it alot, but far from making have a balanced mana management toolkit.