CDC reverses their mask guidelines (again) for the Covid Delta Variant

TheCDC Wrote:To maximize protection from the Delta variant and prevent possibly spreading it to others, wear a mask indoors in public if you are in an area of substantial or high transmission.

The CDC has just changed course again (it's, what, the fifth time they've done this in the pandemic?) and just stated that vaccinated people should keep their masks on while in high-transmission places (there's no clear definition on this) due to the Delta variant.

Do you support the decision? Hate it? Wonder why they keep flip-flopping back and forth? I'd like to hear your reasoning on this. I don't live in the U.S. but we probably will still have to follow guidelines like these, so it would be nice to hear your reasoning on stuff like this.