This JIRA captures an idea from the mailing list to prevent it from getting lost.
What if applying your preferences to a page causes it to break — or the presentation of it to break — so that it is not usable. This is something that won't be necessarily detectable by GPII. But just going back won't work either because the page in native form would not be usable.
Try Different = (try a different way to make this page work for me)
for example — if it started with larger fonts (and this didn’t work) pushing the "Try Different" key would cause it to try ZOOM instead.
In our case, it might try either different strategies or different context setting sets or a combination of these as the person says try different.
This might indicate a simple "TRY DIFFERENT" button should be on the Personal Control Panel (PCP).