The YouTube video below talks about all the key new features of Photoshop 2021.
The sky replacement tool is getting a lot of coverage. The ability to easily replace a boring sky with something more interesting is great and can really improve an image. Although if the sky is boring, then often the light in general will be boring too and adding a stunning sunset to your dull flat landscape, won’t make your image look better, just odd.
Like most features in Photoshop, they only work well with experience amd practice. Retouching an image should never be done in a rush, returning to an image a day or two later with fresh eyes will reveal whether you’ve done it just right, or gone too far.