It may very well not be necessary, at least in the short term. I held off on doing mine for a while to see if anyone posted about undesirable effects from the update, then decided to proceed after the reports people posted seemed positive (better signal and battery life). It's been a couple of weeks now and everything seems the same, the only negative so far was that the update installed the latest version of Maps which sucks so I had to go back to the older version.
That said, as you can see by my profile I'm on Metro not VM so there may be some differences between the update for our respective phones. Also I'm not worried about throttling since I'm on an unlimited 4G plan.
I'm sure as time passes more specific details will emerge about what these updates actually do (and don't) do.