Technology which reduces work load has to be good. We all know the pain of keeping numerous bulky and heavy aerads up to date hence being able to download updates and have all the data on a couple of I pads is a huge time and effort benefit.
What I think they maybe getting at with the GPS comment is twofold! Firstly that any technology has to be a positive addition to pilot skills not used to cover up a lack of piloting skills.
Secondly that technology can make for lazy pilots and lull pilots into forgetting or ignoring those skills ie do not put your eggs in one basket scenario. Use everything that is available and trust nothing.
Well that is how I would interpret the caution.