Yes...this exactly. The CDC guidance does NOT say that no one should be wearing a mask outside. The new guidance says FULLY VACCINATED people are very safe not to wear a mask outside in all situations, but unvaccinated people should still be wearing masks to be safe outdoors if they are at a small gathering with mixed company (some vaxed and some not). Unvaccinated people, even wearing a mask, are “least safe” if they “attend a crowded, outdoor event, like a live performance, parade, or sports event”, which is exactly what outdoors at WDW can be like, especially during shows, parade, fireworks, etc. Even just trying to walk from attraction to attraction I would call a “crowded outdoor event” during many times of the year.
Current CDC guidance for outdoor activities for vaccinated and unvaccinated people:
https://www.cdc.gov/coronavirus/2019-ncov/daily-life-coping/participate-in-activities.html
So I also understand why people might not be happy with these current changes....they don’t actually follow the latest CDC guidance. I understand why Disney is doing it. I’m sure they’re getting a lot of pressure to do it, and no one enjoys wearing a mask outside in heat and humidity of a Florida summer, but they are being way more lax than the new CDC guidance. You can’t equate a small outdoor gathering with only fully vaccinated family and friends with visiting WDW at even the least crowded time of year, but that, or being outdoors with your only immediate household, are the only two outdoor scenarios the CDC is advising unvaxed people not wear masks.