Not having the app installed but being a monthly active user, not just someone who's driving by because they clicked on a link on mobile seems like an edge case and I'm pretty sure it won't make a difference to the numbers.
One of the main reasons I don't use the app is that it makes it harder to bookmark.
A website being used in a web browser seems to you like an edge case?! Really?
If that's really a common view, we really did lose the plot.
That's funny because the Bluesky app is the only social media app that I have installed. Everything else I do from the browser.