My previous, Retina MacBook Pro (not the USB C-type ones), was set to 1280x800 by default back then, which was also the resolution of my older MacBook Pro I had before that.
It looked very sharp but preferred 1440x900 (which was what the MacBook Air's had at the time). For some reason, it did give me a headache the first 2 days but I used it like that for years and really loved it. 1280x800 gave me too little room to work with.