Not being able to disable the warnings with action=parse and text='something' is a significant problem for the 'whoColor' service and similar tools.

It would be nice if we could at least pass a param to explicitly disable warnings.

Related mailing list discussion: https://lists.wikimedia.org/pipermail/mediawiki-api/2017-July/004021.html
whoColor issue: https://github.com/wikiwho/WhoColor/issues/6

Besides the use cases outlined in T137900 that probably inspired the "give a better warning system" naming of this task, I thought of another: several templates emit the user name / timestamp as an indicator of who last touched a particular page and when that page was touched. I believe this is done to help identify whether a page may have been maliciously touched, or whether the author particularly has been active on a page.

See e.g. AFC submission and Db-meta, templates important to the drafting and speedy deletion processes respectively. I don't know the precise utility in each context, so verification with the editors involved in those processes, with a migration plan in place for some other magic word or similar, would be prudent before total deprecation.