While I completely agree you should be warned about these issues I'd like to add they are both quite insignificant. The reverse guidelines issue is the lines are just slightly misaligned because the update firmware is actually from Megane, where the reverse camera is positioned differently. The guidelines themselves can be adjusted to the proper position with ddt4all software, but even without this adjustment the camera and parking sensors are fully operational and usable.
As for the voice control I don't have this issue on my car after updating to 3.3, not only that but I find google assistant (from the android auto suite) is so much better for voice control than the built-in feature (and it is activated from the same button on the steering wheel too).
I really think the android auto feature alone is so worth the upgrade, I'd do it even if there were more serious issues.