Well quite frankly I don't think that's going to happen. In Oppo's case it was probably costing them too much $$$ in customer support, bricked device warranty arguments, along with unhappy customers. That was from the many posts I read back in the day on Oppo Forums, now discontinued. If you knew what you were doing as a tech enthusiast, and had sufficient knowledge of the issues, they were usually okay.
The Oppo Reno6, it's a reliable and competent phone from what I've seen, but if you want to root and hack it...Good luck! You're on you're own...no devs. no fun.
For my own uses now I just want a reliable smart-phone that always works. so I have a Samsung these days, unrooted and unmodified of course. The Oppo Find7 I had running CyanogenMod, would occasionally take a dump and reset itself for no apparent reasons. Along with so many, especially banking and financial apps, that will not run on rooted and modified device.