I just realize that there are reasons behind this >3000 CP high motivation dropping rate

It's been said that you cannot use legendary pokemon to defend gyms so mewtwo isn't the reason i guess. As for slaking they will probably give it some really terrible attacks to offset the stats like in tha main game.

I don't think it's casual vs hardcore (raids are definitely not for casual players) but more how they wanted the game to be played in the first place.

They want to create a more dynamic gym sistem that rewards legwork and coordination (even without a built in team chat, lol) rather than having the strongest defenders and keeping a gym for a couple of days

The dumb thing is that 2999 Blissey is simply TONS better than 3000 Blissey...

I still think this will change as everyone's hard work, etc is wasted on 3000+ Snorlax, Blisseys...and this idea just sounds idiotic to me.

If they wanted, they can just have it drop 10% > 3000, then once the mon drops below 3000, go back to the 1% like every other < 3000 mon.