Supporting older WordPress versions in a Plugin/Theme? [closed]

Supporting old versions of WordPress seems reasonable, but is it really necessary? Personally, I think supporting old versions is waste of efforts and time and it prevents end-users from updating their WordPress installs. What’s the point of being a WordPress developer if you’re encouraging users to remain using insecure and out-of-date versions?

Just adding a function that checks the version of the DB/WP version and displaying a warning message if the site is running outdated version will remind the user to update; everybody knows how to update WordPress these days–just a couple of clicks and WoW, WP is running the latest version.

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