Netflix had Dolby Vision and HDR, this is just adding HDR10+. HDR10+ is similar to Dolby Vision in that it give your TV dynamic metadata for the HDR. Constantly adjusting min/max brightness of the scene.

For dynamic metadata Dolby Vision support is much more common in TVs, some brands like LG don’t have any support for HDR10+ even in their high end TVs.

I am pretty sure from a content perspective Dolby Vision is also much more prevalent. It does look like most streamers support HDR10+, but I don’t think much of their content is available in HDR10+.

Anyways still a good change. HDR10+ is royalty free unlike Dolby Vision, and it is backwards compatible with regular HDR TVs.