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Well, the parent was talking about their even older DSLR and their equally modern phone, so I'm not sure what your point is. Nobody is claiming that a 2020 phone is anywhere close to a 2020 (or 2015, for that matter) DSLR or mirrorless camera.

Are there DSLRs with image processing features like Google's "Night Shot"? Where you can take a very long hand-held exposure and it will never be blurry?

Not quite but close. My Sony A7ii will take a 2/3s of a second exposure by stacking four shorter exposures and using stabilization.

2/3 of a second with an f/2 or f/2.8 lens means you can take pictures lit by not much more than starlight.

Actually, even without this, with an F/1.4 lens I can take a handheld picture using only light pollution.

To a very old and entry level camera.