I'm going to assume you are talking about photos. I've offered photos on my own site in 1024 and 3000 on the long side for a few years now. Honestly only a very few members ever download or even view the 3000 size. I'm more thinking about how to satisfy Retina screens going forward this year and into next now. Like you said, the 'stretch to fit' is automatic now, so lots of people don't even notice the various sizes, in my opinion.
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