You're certainly opinionated about something that it doesn't appear that you know very much about.
In-app notifications, SMS and web push notifications are all important means of communicating events that clinicians need to be aware of.
This is delivered via a PWA so that it works on the wide variety of devices we see across patients and clinicians.
Many elderly patients are confused by native apps and app store experiences. Many of them refuse to use an "app". Additionally, things like accessibility are problems that have been solved effectively on the web but can be more challenging with native apps.
Many clinical devices don't support app stores or installation of native applications.
When you've tried to implement reliable health care systems for elderly populations, clinical settings, mobile in-field settings and physicians in a HIPAA regulated space perhaps you'll be able to tell me a better way.
Your assumption that we use any technology because "we want to" indicates that you don't have much experience with this stuff, perhaps it would be better for you to reserve judgement in the future until you understand a subject a bit more thoroughly.