For quicksurveys, we need two more data points to be collected in the related schema: event_pageId and event_pageTitle. The reason we need these are:
1) Eye-balling any issue in EL data collection is much easier if event_pageTitle is collected. Being able to eye-ball the responses from different pages can help us identify possible sampling issues more easily and quickly.
2) We want to analyze webrequest logs with the additional data collected via quicksurveys and for that, we will need event_pageId and event_pageTitle, on top of clientip, userAgent, and timestamp to be able to correctly match a survey response to a webrequest log.
Other reading schema can also benefit from this information, since what page the user is on when an event happens is a critical point of information. Whether this is added to all schema or not is subject to more technical discussion.