The concept assumes that you simply don’t have two apps on your smartphone to download games and apps.
You only have the Galaxy store icon. And when shopping, the title appears underneath (“made for Galaxy” - Samsung store, or app specifically changed for Galaxy devices) or (“Download via google play store” - Google store).
App updates will only happen from the server from which it was downloaded.
Example:
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Google Meet (title: Made for Galaxy, despite downloading from google servers this app is specially changed for Samsung)
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Youtube (Download via google play store)
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Genshin impact (it is available in both stores, but on Samsung servers there is a special version for galaxy, so “Made for Galaxy”).
Why would Google ever want to do this? There’s no benefit for them.