What about information about which version of MediaWiki parameters were introduced in, deprecated in, and probably most importantly, deleted in? I didn't see anything like that in the version of the page after the template was applied. Take, for example, the profile parameter of OpenSearch. If I'm designing a bot, and I'm targetting 1.25 and above, I need to know that that parameter was only introduced in 1.28, and that I can't use it (at least not without some kind of version check). On the previous version of the OpenSearch page, it was obvious at a glance. Now, it's nowhere to be found (unless I go through the page history, which isn't a tremendously useful way to find information). Similarly, if an older parameter is deleted, I need to be able to see that it's deleted at a glance, not read through a bunch of existing parameters to determine that the one I'm using is no longer there. That's why we had the API Param template in the first place, was to document all this kind of information over and above the auto-documentation.