This is an interesting topic...
Up front, I think Annika is a dolt and blowhard, but when she was setting records I was in her camp vs. Karrie -- would flip that were a time machine in my possession.
That said, and not necessarily for the right reasons, I do believe she has arrived at the proper conclusion.
On the PGA Tour caddies are going to walk it off to get the front-edge yardage, no matter what...then do the pin related calculus from there.
This process (on the PGA Tour) will never be superseded by a rangefinder.
Then, and just because it's an available option, caddies will get out the rangefinder and doublecheck, just because they can. And THEN, if there's any doubt about what the laser might be bouncing off of the caddie will hand said rangefinder (a CYA move) to the player in order to have him confirm what's coming up on the RF screen.
Net/net, introducing rangefinders will only serve to slow down play on the PGA Tour.
PS...when a REALLY wayward shot is hit into the next fairway or something like that, a rangefinder will save a bunch of time. However, that probably won't happen enough to offset the time that is lost on all the routine shots.
NOTE: I despise that fact that the PGA of America now allows rangefinders in their (now borderline) major championship -- complete nonsense. I also despise the fact the USGA allows rangefinders in our/their various National Championships, and I have caddied in a whole bunch of them.
PPS: Rest in peace J.D. (John Doherty)...a gentleman and fine human.