So the thing I really llke about the Google Messages app is that it easily let's you have full functioning txt/sms/RCS on any web browser. I have a Galaxy Tab A 10.1 and by a simple one time setup involving taking a picture of a QR code I can add a shortcut to my Tab and have my messages any time. Opening Samsung flow on 2 devices is honestly a hassle.
Or you could expand the 'Call and Text on other devices' availability to more devices. Have just txt on other devices if phone functionality is not feasible.