First, a must have setting. This will let you see the fairy name so you can see where you placed her. You will not be able to cast anything on the fairy:
Settings -> Character -> Control -> Target -> Untick "Disable targetting of pets and minions when in battle".
Feedback after a few days of 80. No Extremes yet, waiting for people to max level.
I'm happy with the Embrace nerf. There's also been an overall healing nerf due to HP scaling. I'm also happy with heals being weaker relative to the total HP of your party members. There seems to be more damage going around, but this may just be due to lack of gear. I've not seen a wall-to-wall pull on a fully geared lvl 80 tank. I have no memory of Stormblood raid wide damage to compare, so all I can say is - could use a bump in frequency to make the relatively weaker heals necessary.
I'd like Energy Drain back or an Aetherflow dump in some form. Sometimes I need all of it, but this is generally due to people getting hit left and right by mechanics in encounters they've never seen before. I expect excess Aetherflow to become more and more common over time. The lack of Energy Drain makes things a bit awkward.
And finally, I like the MP management changes. If you're consistently forgetting about Lucid, you will have problems.
Piety scaling is linear and around 22 piety for each 1 MP per tick. If you scale this to a minute, your extra piety is approximately your extra MP per minute. E.g. 440 Piety ~= 400 MP per minute. I don't expect it to be necessary in Extreme, but possibly in Savage? Who knows.