It is relatively straight forward to use your email to send an SMS message to a phone. This is free and not that hard to setup. Since Hubitat is phasing out SMS it would be nice if you would allow for email, the user would then decide (in their email account) what phones get the email as an SMS message.
I understand why you are phasing out SMS, with the Hubitat app it is now easy to receive notifications on your phone through the app. Since many of the notifications I have set up are critical (i.e. house is flooding, house is being burglarized, house is on fire, etc...) it would be nice to have some redundancy in how I receive these notifications.