The pretty screens are nice to look at, and can display a dizzying amount of information. But even the basic display takes more than a glance to interpret.
A round altimeter should point straight up when IFR and straight down when VFR, but with that fancy digital display, you can't give a quick glance because it doesnt point at anything, and even when changing it doesn't ever move--you have to look, recognize the number and decide if it's correct. The VSI appears and disappears, but I like seeing it point at "0" rather than reminding myself "if it's not visible, then I'm between +50 fpm and -50 fpm," so my altitude will only change slowly--watch the number and see if it changes to stay level."
My plane easily goes 500 nm with factory fuel gages and the wind-up yoke clock. I've recently made three round-trips, KALX to T41, 505 nm each way; longest flight with unfortunate headwinds was 4:40, the shortest with great tailwinds was 3:00. Easy easy, no mental stress about running out of fuel, and no need for a 10K instrument upgrade first.
I had high hopes for Dynon, and was planning to install Skyview and AP to replace my aging Brittain AccuTrak and AccuFlight, and enjoy some time with the pretty TVs. But they shot themselves down by canceling the Vintage Mooney fleet, so now I'll just see how much longer I can nurse the Brittain along. New boots all around should get at least another decade. And I won't have to worry about relearning to fly with a standard VSI after almost 18 years with my lovely IVSI, which has really spoiled me.
To each their own. The beauty of owning your airplane is that you can truly make it your own, in ways that were never possible with ground vehicles in the past, and are certainly not available now.
And I'll put my steam gage C up against anyone's glass C, and the difference in flight time and operational workload will be minimal. I'm not worried about selling, as a freshly retired engineer, I'm in for the long run, looking forward to UFO status in a couple of decades.
Yes, I do now use my tablet, because it's so difficult now to get (real, paper) sectionals and approach plates . . . I'm on my second "flying" tablet since replacing my first-and-last overpriced iPad mini with quality Samsung tablets and no-cost EFB.