Maybe you should mention that AJAX was introduced in 2005, XMLHttpRequest was already known in IE5.0 in 1999. So all this "changes" happened long ago. Using asynchronous data operation is a standard today, and there are many different options to do so. As XML is not very popular any more, most people will possibly use the fetch API or some high level tools like HTMX, that cover the complexity of plain Ajax in a more userfriendly package.
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Maybe you should mention that AJAX was introduced in 2005, XMLHttpRequest was already known in IE5.0 in 1999. So all this "changes" happened long ago. Using asynchronous data operation is a standard today, and there are many different options to do so. As XML is not very popular any more, most people will possibly use the fetch API or some high level tools like HTMX, that cover the complexity of plain Ajax in a more userfriendly package.