>>103
I'm using 24.5.1 (mid-2015) for now, and I'm unlikely to move one way or another for a while. A rational was given in >>105, although version 24.5.1 fails to achieve this for the most part. I'm not a member of any GNU Emacs communities, and so the only social component I utilize is the aspect where people I don't know write free software which I can choose to adopt or not at my discretion.
As far as why I'm so eager to not adopt this is because the community does not have the same goals as I do. If each release and new package resulted in a reduction of complexity and better abstractions then I would be eager to update and look for new packages. Selectrum, and Vertico represent such an improvement over Icicles, Helm, and Ivy, but packages like these are relatively rare (and many old timers would even consider these unnecessary using only icomplete and ido).