No, "we" haven't moved on. "We" understand why you like, it matching your opinion (which you overvalue).
RF was the first attempt by a statistician to look beyond fielding percentage when rating defensive players. When Bill James created this he was working from his house on his own dime and didn't have the resources for something more comprehensive, which would require a staff, access to game tape for all games, and time. When Stats Inc. was started up by John Dewan, you had someone who had the resources to start a venture that would provide the information that he knew there was a market for. Along came ZR (zone rating), which determined how many opportunities each player had inside his fielding zone. Of course, the flaw here was that it assumed each opportunity was equal, and the reality is that some opportunities are more difficult than others. UZR adds the context of evaluating the quality of the opportunties.
Obviously, it isn't perfect, but if you consider the methodology, it's attempting to measure defensive range in a fair manner. The main problem is that it still remains subjective, like your opinion, but they at least they have an established set of parameters they use when applying the subjective qualification of each opportunity.
The ideal stat would remove the subjectivity. For example, in the future, a sensor system (with miniature transponders on each players uniform - hat, belt, somewhere) could track how far a player had to move to field each ball and how much time they had to get there. The distance/time relationship would be an objective average for each position based on measurable data.
IMO, we'll see this, or something similar, in the future as the appetite for meaningful information has not been sated, but where we stand right now is pretty good.