Harry -
Your rant is just fine... no argument on it. Anything except riding is a distraction. Unfortunately - the distractions - if you're actually going somewhere aren't limited to the electronic gizmo's the bikes come with.
A GPS is a tool - it can be used or misused.
Mine is a useful tool that keeps me from being distracted when used correctly. Mine has text to speech - meaning it talks me through a route, I don't have to look at it to navigate. MUCH safer than the map in a tankbag, or on the sleeve of my 'stitch, which is a major distraction.. since I have to LOOK at it, then focus on it and find where I'm at and then find where I'm looking to go.
None of these steps are necessary with a modern route planning GPS. The GPS also allows me to plan my route ahead of time and download it to the GPS - just like marking up a map the night before a trip.
Your friend found an interesting use of the GPS - I spotted it and used it a bit on Rt 33 and 66 in West Virginia.
Zoomed in to the highest zoom level, a good modern GPS is remarkably accurate about the road twists and turns. This is good info - and info that can be captured at a glance if your GPS is located so it's in your field of sight - when doing the extreme twisties like 33 and 66 have.
You know if there is a straight section coming up around the corner or more twisties - helped me to decide between 2nd and 3rd gear. If I was heading to a straight, upshift to 3rd and power out of the corner. If there were more sharp twisties - stay in 2nd and throttle up/down to take the corners. Good info - can be used with safety - it shouldn't overrule your primary sources of info, but as supplementary info - it's useful.
You seem to dislike the OBC (On-Board-Computer) - I'd question why - but then I know what your other bike is..

It's also a tool. Just like the tripmeter on your airhead. You don't *have* to look at it while riding - but having the distance to empty displayed where you can easily see it keeps you from being distracted trying to interpret what the fuel gage is telling you and doing the mental calculations you do looking at how many bars are showing.
You can easily toggle between the different functions - moving - or better yet - when stopped. If you wanted to know your average speed for your ride up Rt 81 - it would have required two steps:
At the beginning of the ride - you reset the average speed reading. You do that with the INFO button. Press it until the average speed is showing and hold it down. It resets. That's it..
At the end of the ride - you read out the average speed. That's the second step.
Not too distracting actually - and useful info. Ditto on MPG.
I reset each of these, and Tripmeter #1 whenever I get fuel. Then I can keep track of average speed per tank of fuel, average MPG for the tank and how far I went. Write the numbers on the receipt from the gas pump and you have the info you need to accurately calculate MPG vs speed.
We used to do this by keeping a bike log - remember those? The little spiral notebook and the pen?
I can understand your rant - but - used wisely - modern technology adds to the safety and the bike experience and isn't something to run away from. It's tools - that must be used wisely. A fool can kill someone with a screwdriver - but it's a useful tool in most of our hands.