"Not trying to start anything here , just telling you why I don't do it . "
No worries remember I am trying to learn here, I may not agree with you but I want your opinion/experience otherwise I would not ask.
Been doing it for over 25 years on motorcycles(all 4-stroke) , learned at the dealership. Never have seen a problem with injectors,sensors, rubber parts etc but it may be in the type used (aerosol fogging oil) It sounds like you are using something heavy? As well as how it is introduced. we fog through the intake with the machine running or if possible straight into the intake tract often through a sync port or vapor recovery line. It is mandatory on anything running race fuel and we always do it in the fall when the bikes will sleep for 6 months.
No need on these machines for pistons , rings etc as the nikasil and rings will be fine it is really to preserve the valve seal and prevent needing to pull heads and cut seats.I would want iron lined cylinders to be protected to prevent rust rings and sticking. I get that atv's do not get much love (based on the care of used ones I see) so performance is not often top priority but the time to fog is minutes vs a potential loss of what power it does have seems worth the risk. Hey look at it this way I am happy to be your guinea pig , fresh seats and valve faces . No injection here so I assume I will not suffer any failures with those components.
What is a IBV?