You know that Flying Book was added as a Mage Tower reward BUT the mage tower is up forever, even though I do think the difficulty should be reduced in some ways at least you can keep trying.
The Slime Cat is going to be a time limited reward, as I understand it , and is going to require Normal Raiding to get? That seems off to me personally.
I 100% agree on it being in LFR but the time constraint is only making this a worse situation. If Blizzard is deadset on having a raid requirement then make the mount not a FOMO reward. Its a for fun season, why would Blizzard even mention a Free Carry service like the Friendship Moose runs when Blizzard even states its a season to test things?