Wearing a mask outside is still very essential for people's health, especially in public places. The science around masks themselves hasn't changed at all. It is the situation that has changed, and as a result, authorities are issuing much needed updated guidelines. We're in the middle of a fast-moving pandemic, and the state of the world is far different than last year.
The scientific community, health agencies and healthcare providers are continuously reviewing all available data and making real-time recommendations as the situation evolves more and more. Given that there is now a high prevalence of COVID-19 in the wider community and the understanding that individuals with COVID-19 may be contagious even if they are not showing any symptoms, it now makes sense for all individuals to be wearing a face covering to help prevent the spread of droplets that might be infectious.