Yes to the bold. I currently use one that is neither Apple, nor Android. Actually runs on Windows and fits IN my panel. Though they offer the Apple option as well for people that like having stuff on their lap or yoke - which I don't understand at all. You're IMC, looking down causes SD, but lets have something that sits on our lap, or better yet covers up instruments by clipping it to the yoke. Fly on, brainiacs!
And yes, I will spend 3-4x the money just to not deal with Apple or ForeFlight because they have lazy programmers.
I think this misses the train the already left the station; mobile devices have, and will continue to have, superior applications over systems you can put in your panel. Why? For the simple reason that they can be cheaply and easily upgraded in ways that panel systems probably never will be.
Of course the mobile stuff isn't isn't certified which is a mixed blessing. But the panel mount equipment isn't necessarily certified for the experimental crowd. But even if you take the certified piece out of the comparison, mobile devices will continue to improve and advance faster than any affordable panel solution.
I have a (3) EFIS GRT experimental panel with a G430w for smarts and a Navworx transceiver for ADSB in/out. Recently I noticed that GRT added geo referenced plates. So on my panel I have synthetic vision, moving maps, overlayed weather, traffic displayed on the map (and in syn vision), geo referenced plates. A very solid and comprehensive set of tools for my IFR flying.
But despite that, a FF powered iPad is a powerful and much valued tool my cockpit. I'm on my 3rd iPad due to upgrades, and I built a custom center console to optimally hold a RAM mount for the iPad. It sits in mid-air over my lap and under my right hand. It's so handy I even write clearances on the scratchpad for a truly paper free cockpit.
I fly entirely by reference to my panel but I plan and maintain excellent situational awareness by reference to the iPad. Rather than precipitating spatial disorientation, I find that it helps avoid it. The iPad blocks nothing and is easily included in my expanded scan. More important, I'm able to keep the panel setup for the tactical flying at hand while the iPad/FF tool can be used to look at maps, approach selection, alternate routes, etc. IT'S GREAT! BTW, I got my IR rating and got it very wet in a non/AP round gage Maule but when the G396/XM came out, it was clear that it was the most powerful instrument in the plane. I knew immediately that portables would be part of my cockpit for some time to come.
There's an instructive parallel with competitive glider racing. We were first adopters of GPS technology due to a rules loop hole. We had purpose built, GPS driven, panel mount glide computers before the first aviation portables even hit the market. These units instantly changed everything in racing. But what happened very quickly was as general purpose portable devices became available, the latest apps and newest functions became available on portables. No matter what panel mount computers were on board, the latest and greatest would be available on a mobile device and soon gliders were festooned with mounts for multiple portable devices.
Low cost and high function drove the mobile device proliferation in soaring. It will do the same in our airplane cockpits for the forseeable future. Denying that is head in the sand stuff.