First, it's not "updating the resolution."
Second, it depends on the app. There is no magical switch that when flipped makes the app work on every device. It could actually be a pretty extensive project, and if it's an app that brings in little revenue there is no incentive to spend the time or money.
And finally if you want the answer, email the developer and ask.
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Because the apps aren't fully optimized for 1% of all iOS devices in use? Get over it. Your life will go on fine for the next few weeks until the apps for your $1,500 phone are updated.
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Incorrect. Apps have to be built with the iOS 12 SDK. That is not the same thing as making changes to an app so that the UI is optimized for a particular phone (e.g., removing the black bars up top near the notch).