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ok. thank you for your help.

Would it make sense in the long run to move away from adding .html? I don't want to jeopardize any rankings but I also like to keep WordPress plugins to a minimum.

A site I may take over has a plugin that adds .html to the pages. I searched online but I’ve only found how to add it rather than why to add it. Is it needed? If I remove it, I’ll have to be careful with SEO / indexed pages and redirects.  The site is running 3.x.x and 90% of the plugins have not been updated in over 5 years including this one. Before I update to 4.7.x, I am trying to understand the landscape (pros / cons) on why something could be used and if I need to find a suitable replacement for it.

A site I may take over has a plugin that adds .html to the pages. I searched online but I’ve only found how to add it rather than why to add it. Is it needed? If I remove it, I’ll have to be careful with SEO / indexed pages and redirects.  The site is running 3.x.x and 90% of the plugins have not been updated in over 5 years including this one. Before I update to 4.7.x, I am trying to understand the landscape (pros / cons) on why something could be used and if I need to find a suitable replacement for it.

ok. thank you for your help.