I must also add that I think anyone wanting to drive a car should complete a motorcycle course first
I've been saying this for decades ... I have also suggested that anyone who wants to drive a car should get a pilot's licence first, or else the driving licence training and test should be raised to the PPL level (in terms of attitude and safety). Trouble is that refusing driving licences to a large chunk of the population would not be practical politics.
Spot on, but as you say, impractical. Most wouldn't meet the standard so either the roads would be full of illegal (and therefore uninsured) drivers or the economy would grind to a halt as immobility takes its toll.
But glider solo before PPL? I agree! Not least because that's how I did it! However, when I was being instructed as glider stude back in the early 70s, I recall a grizzled gliding instructor saying "these people have no idea how to fly, so how can I teach them to glide? They should go get a PPL to learn flying, then come back here to learn gliding".