I think you mean Subject selection in Lr. By saying no new feature, I mean no new tool has been added (unlike previous versions). IMO since five years ago, Adobe manoeuvres just on Subject selection tools and AI and NF (Neural filters). They (NF) do their job, but how?! Most of the time, the result is rubbish and needs more human work! Not practical yet, they want to grab new younger users that are lazy to use old methods (to select a subject by channel or colourizing an old photo). Adobe just makes the first step a bit easy for them.
Luminar has done a great job. I used that for a week (not on my PC). That's awesome. In some areas, it's even beyond Photoshop. I think they are Photoshop ex-engineers that have made such a great app. Its AI feature is more powerful.