Yeah, definitely I was simplifying a lot, borderline misleading perhaps even.
Before XMLHTTPRequest there was also a time we were doing requests via ActiveX as well, but I did it so briefly I barely remember how it worked by now, and I'm 99% sure this was exclusively in IE as well, maybe IE4 or IE5. I'm not sure if the issue mentioned earlier with cross-origin requests may have been exclusive to IE as well, but I think there was a larger window than "blink of an eye" that it was a issue.
But again, this is all long time ago, and it was in the beginning of my career, I might misremember and you may very well be right.
XMLHTTPRequest was originally an ActiveX object (something like ActiveXObject("Microsoft.XMLHTTP")), that’s probably what you are thinking of. You couldn’t make cross-domain requests with it though. Other browsers then implemented XMLHTTPRequest based on the ActiveX object, and then Internet Explorer supported XMLHTTPRequest and dropped ActiveX.
Before that, people who wanted to make cross origin requests sometimes used Flash but I think that always needed a crossdomain.xml file to work. JSONP was also used, which is where you source a <script> from the remote that calls a function in your own context to pass information in. You needed to be a little more careful with that, but only because you were deliberately passing information in; the browser couldn’t read it by itself.
I’m pretty sure the SOP has been effective in all non-Netscape browsers from as soon as they started supporting JavaScript.