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>2560x1600 on 16inch monitors.

2560x1600 is what Apple used to do on a 13.3 MacBook Pro or MacBook Air, at roughly about 226PPI. That is what used to be the standard for Retina on Mac.

At roughly 180PPI. Unless you view it from 19" distance it doesn't quite fit the definition of Retina from Apple. But may be it is the sort of Good enough scenario for many.

Interestingly even ~220PPI should leave plenty of room for Mac usage. But Apple decided to pump it up to ~260 for reason I still haven't quite figure out, nor have I seen anyone on the internet gave any plausible explantation. ( Most likely because no one gives a damn about technical details any more. ). I much rather they drive the 120Hz refresh rate rather than pixel count.