My understanding is that this dialog won’t appear if you update apps from f-droid or other 3rd party store, but only if:
The app was installed from one store (or just the play store, not sure), and
You are now trying to update the app by downloading an apk from somewhere else (e.g. a browser)
That would normally fail because the signatures don’t match, but I guess there are places, like apkmirror, where you can find apks that are signed by the original developer (and so, they are authentic and 100% safe), but then google will give you a warning that you might not receive updates and such.
At least, that’s my understanding. A tiny bit annoying, but not a big deal.
My understanding is that this dialog won’t appear if you update apps from f-droid or other 3rd party store, but only if:
That would normally fail because the signatures don’t match, but I guess there are places, like apkmirror, where you can find apks that are signed by the original developer (and so, they are authentic and 100% safe), but then google will give you a warning that you might not receive updates and such.
At least, that’s my understanding. A tiny bit annoying, but not a big deal.