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Updates to Xcode added what Android's tools have had for years, which is the notion of generating multiple binaries for different devices/profiles. Xcode then signs those independent sections and packages them together in an archive, while Google has you send them up separately, each signed separately.

Apple sort of presented it like the App Store is picking and choosing, but it's the enhancements to Xcode that actually enable the functionality. Google could add some tooling improvements to make it slightly easier, but really they've already done all of the hard parts.

Expansion files were a hack, and remain a hack. They are necessary for large games obviously, but really 100MB encompasses the enormous bulk of apps with ease. It would be ideal if Google simply abolished expansion files and folded the sizing into normal APKs.