There’s two things to keep in mind:
- Different devices report LQI differently, what one says is 100 may be reported as 200, or 11, by another
- Works matters more than a number. If your device is working fine, don’t worry about it
In short, treat the number as just a number. If it’s fairly stable that’s more significant than a specific number, or range of numbers.
As for re-routing, that’s entirely up to the device. Most routers will re-route as they see fit. End devices are more of a mixed bag. Xiaomi are known for being sticky, they almost never change parent. Other brands vary.