My two cents.
The notification module was working but not perfect right now. If the buzzer was used with notification module, the module had to be enabled by CLI but could not be disabled by using APP. If using the device with phone, this results in the Buzzer still making noise when the device needs to be muted temporarily.
This problem can be solved by hardware or by software. The advantage of hardware solution is that still only one MCU IO is needed. For example, a selector switch is added to provide three options, Buzzer, LED, Mute. All three options are controlled by same pulse signal from the Notification Module. The LED is controlled by the latching circuit, and the LED will light up each time it receives a pulse signal from the Notification Module, press a button to reset the latch so that turning off the LED.
If the TX Power range could be defined in the variant.h for each board could be a plus. E.g. due to hardware limitations, the maximum TX Power of a certain board is limited to not higher than 14dBm, although according to the policy, 30dBm is allowed.