Yes, this is needed especially for those guests that are not constituents as it is difficult to pull their mailing address to include them in mailings for event follow-up or to invite to next year's event.

Also, we have users who just have access to view Events so they can export the listing of attendees and such. Without having the addresses in the export, I then have to pull this information for these users. Having the addresses as part of the export would allow them to have all the data they need for the event without having to wait for me to pull it for them (these are not users who don't want to have to use query/export)