The 500s are a lot better today then they started out to be but I'm still not convinced mostly because of some reports still coming in. I know others will say there's are perfect and not to worry about it and probably depending on your application they may be right. Still..JMO, pay the little extra for the 800. Still not perfect by any means but the less you stress an Chinese engine.. the longer it will last.. IMO 
you have to remember that a vast majority of these reports are user induced...
You aren't convinced? Whats your firsthand experience? i'm not being snarky, just curious what you have experienced yourself that makes you believe the machine is not adequate
I think its funny how you always make extra sure to give the disclaimer not to stress the "chinese" engine... like its somehow different than "american" engines built with Asia sourced parts.
The 17's suffered from the crankcase venting issue... thats a thing of the past and was remedied via warranty bulletin at no cost to customers. Some machines needed the bulletin completed for the stabilization of the head (mind you a bulletin that addressed the POTENTIAL of an issue and no reports of said issue ever happening).
NONE of these situations apply to a 2019 machine.. Not really specific to the 500S, but the ATV line in general, that people had issues with needing to push the foot brake down so hard to release the shifter lock out... the 2019 does not have the shifter lockout (it can be easily removed from any machine if its giving your trouble)
When you are plowing, run in low. If you are plowing into a pile, let off the throttle right before you hit the pile and don't try and force the machine into the pile ones its stopped, you will load the transmission and have a bear of a time getting it out of gear and thats how people break stuff.
Also keep in mind that the CFORCE 500HO, CFORCE 500S, CFORCE 400 and the new CFORCE 600 all share the same basic engine design...