5th job to be released this year.

Mercedes only have 5 buffs (not counting MW, 6 with that, and not counting their elemental sprite as it's arguably a summon and not a buff), one of which is becoming a passive soon. Also not sure what "floor collision" means, or what bugs you're talking about. I only know of one bug where you'll disconnect while using combos too quickly on airborne monsters... Which happens so rarely to me that it's pretty much a non-issue. That's actually the only bug I've come across in all my time of playing the class... So if there are others they must just be extremely infrequent.

You disconnect if the mob you attack has very fast recovery from being knocked back, when it's in the air the game just continues to launch the mob up further and further as you knock it back. I disconnected so much on my dual blade at the Lion Airplanes in Fantasy Theme Park when upper stab was the main mob skill. I still disconnect on most black heaven mobs due to the fast knockback recovery.