It would be nice to see improvements to Blynk.notify i.e. set frequency to much longer than 1 minute and OFF when the PUSH messages are really annoying you. Users can turn off internet access or perhaps stop the app from the dashboard but they are not real fixes. Longer notifications periods can be coded into the sketches but for deepSleepers that is not so straight forward as the device is reset on a regular basis and therefore has no effective time keeping. There are ways to do it with code but probably easier and more convenient for Blynk to do it.
DeepSleepers tend to have remote sensors that are not always in situ and therefore difficult to disable if there is a problem with a sensor or whatever is triggering the PUSH messages.