the most famous sentence , "watch your speed first", so i dont think some basic skills will develop under these circumstances
It is true that too much concentration on instruments will distract a pilot away from "feeling" the plane during maneuvering. Any single engine certified GA type will give the pilot ample feel, as to how it is flying, and what it's speed is relative to the stall. The idea that a slow to refresh, uncorrected GPS groundspeed has any use to replace an ASI for maneuvering type flying is silly.
This, to me, speaks of the trend away from learning to "fly" a plane, toward learning to read what its indicators are telling you - because the computer flight simulators are demonstrating that. It's easy for the computer to provide lots of data, and decent visuals. Its difficult for appropriate force feedback to be provided by the computer, and impossible to simulate G forces.
The interpretation of all of these cues in combination is what it takes to fly well. Yes, you can still fly with a cue or two missing, but it will be less well.
It's nice to have all of this extra information when flying, and sure, I use it too, but it is a vital basic flying skill to be able to feel what the plane is telling you, in the absence of indicated numbers. Ths is particularly important when you're flying something different, and you have not memorized all the speeds anyway! (Some planes don't have coloured bands on the ASI to remind you!).
You're paying lots to be off the ground, why would you want to give up the only means to actually hone your skills of being "at one" with the feel of the plane, to allow yourself to concentrate on a bunch of indicators which you can also use on your computer at home? Presuming that you're flying in good visibility, and in airspace which does not demand strict adherence to altitudes, Try flying around with no reference at all to any indicator, other than to monitor engine condition an fuel from time to time. When you're realizing how much the plane is telling you without your reading any numbers, try some slow flight that way. Then, go and land that way.
Your slow flight practice will have reminded you of the feel of just getting on the back side of the power curve, and how to just get there, without going too slowly. As long as you can feel that, without the crutch of an indicator telling you, you can safely land the plane in most day VFR conditions.
You'll surprise yourself. And, you'll be that much better prepared to fly safely when something does fail for real! These skills should be practiced regularly