If you let it idle for a second before you kill the motor it should fire without the hot start. You need the hot start when (not if) you stall it, especially if you have dropped it. I would say the only frustrating thing about making the transition to this bike from a KDX is how much easier it is to stall. If it never stalled guys wouldn’t complain so much about starting it. Think about it...
If I leave my YZF parked for more than a few weeks I drain the carb before I ride it again, this seems to make it easier to start. Of course the smart thing would be to plan ahead and drain the carb when you park it, but unless you aren’t going to run it for a month or more you probably won’t notice. If the gas I use for my bike gets over four weeks old I put it in my truck and buy fresh gas for the bike.
I didn’t ever run out to the garage to start and listen to my two stroke run, but I still like to do that with my YZF. You should probably check your coolant level before you ride it, they tend to get a little warm, and vent coolant, when left idling for any length of time.
Sounds like you got a good deal, I predict you will not be missing your KDX.