>- I find it odd to need an app for a service entirely reliant on off-phone data.

Well, a browser is an app for services entirely reliant on off-phone data :-)

Just a generic one, slower, more battery hungry, with less platform conveniences and access to native APIs.

Isn't your anecdotal statement that which should be replaced by a citation, as it's an of-no-use example-of-one? Whereas what I said might not have been accompanied by a citation, but it's a general statement, easily verifiable, including with citations:

https://www.mobiloud.com/blog/mobile-apps-vs-the-mobile-web#....

Not to mention there's no "grandmother test" as some kind of ultimate marketing gatekeeper, unless you market adult pads or something. I'm pretty sure lots of billion dollar industries fail the "grandmother test" too (youth-oriented ones, self-selectively so).

Same for the CEO of my company. Each additional app is a potential security risk they want to minimize. Web browsers they don’t seem to understand the risks as well. They think of webpages as being a potential attacker on the street that they can just avoid where as an app is a potential burglar of their home with their prized possessions