If you don't use the Android app then SE links always launch in the "Instant App" without asking.
The Instant App has far fewer features than the mobile website or the full app. Most of the actions that seem to be available on the screen just show a prompt to install the full app.
Every time the instant app launches, I have to go to Android notifications, maybe expand the SE notification if I have several other notifications visible, and then tap "GO TO WEB".
On my phone at least, the mobile website provides a much better experience than the Instant App so it's frustrating that I am forced to go through these extra steps every time I visit the site just because I prefer the mobile site to the full Android app.
Instant Apps cannot be disabled individually on Android. You can either use them all or disable them all. I don't wish to disable them in case some useful ones appear. So far Stack Exchange is the only Instant App I've seen, but I would want to opt out of it even if it was as good as the full Android app, because SE is such a good fit for the web and the mobile site is great.
Therefore I suggest withdrawing the Instant App until Android allows disabling individual Instant Apps and the Instant App is improved to provide any benefit over the mobile site.
