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What I think since each front end may be "SEO'd" differently. Unsure how they do in comparison, or which may be better or worse however. Someone out there may know better than I. Overall yes especially with evergreen content on inLEO.

This might be underrated but if people will focus on SEO, I think they should update their old blogs especially that is informative to fit the definition of evergreen content.

Yes, potentially lots of value in doing so.