Rooting will cause problems such as bricking the devices. I am not sure if meizu keeps track if you rooted your device, even after noticing you have to sign in using a flyme account to root. I still don’t know if the service centers will even get information about your device (they provide bad service). And in fastboot, there is a variable for warranty = “yes” even after rooting the device, making me think that you would only lose your warranty if you unlocked the bootloader. After all i don’t care about the warranty as i personally think that rooting the device to enable different features is worth risking to lose the warranty.