Text with standard font style appears smaller on iPadOS than on iOS

I used standard font styles in an iOS app. For example .font(.headline). I hoped that developing this way would allow the adoption of the app to other platforms, relatively easy.

However, when trying to run for iPadOS, the text did not increase in size to occupy the more abundant space offered by larger screen, but it actually shrank. Overall, the app does not look great "automatically".

Why does it happen?

What is the best practice for cross platform development with SwiftUI (with regards to font sizes). I want to make as little as possible human interface design decisions on my own and just let SwiftUI take care of everything. (But I also want the results to look as Apple would consider great looking)

Text with standard font style appears smaller on iPadOS than on iOS
 
 
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