But you're also then missing out on all of the other information the GTN can give you.
One of the things I disliked about going from the G1000 (which operates like a GNS series) to the G3000 (which operates like the GTNs) was the loss of the small windows on the PFD for things like flight plan, timers, etc... The one I used all the time was Nearest Airports (lower right of PFD here):
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Note the traffic window in the lower left too... The G3000 couldn't do either of those, but it could split the PFD so it had an MFD window on one half. You could put traffic there if you wanted. The NRST stuff, though, is all on one of the little touch screens, and one of those touch screens always has to be on the radios, so if you wanted to change anything on the big displays, bye bye NRST. It was enough of a pain that I rarely had it up.