Silvaire, I am sure that you're familiar with the expression "In winter it ain't like summer". You also know very well uropean major airports have never -ever- been GA geared, but rather line geared. Real estate in Europe is at a premium. Hence the European major airport setup will always be optimised towards servicing line operations - because line traffic is what brings the money in. That means handling, no fancy "custom boxes", and minimal GA space on the ramp, with leisure GA being at the bottom of the feeding chain. At most major airports the managers are looking to kick leisure GA out, because they make a lot more money with business GA and line.
Now you can rave and rant about how great GA facilities are in the US and we fully agree with you. I also heard that in Papua New Guinea everyone walks around the jungle strips quite freely. Relevance of that? Zero. The fact is, we cannot replicate that here as much as we'd like to - and if a yellow jacket is going to save me 80 bucks each way to the aircraft, then so be it. The alternative (which i'm not entirely sure you are aware of) is that leisure GA is killed off completely. The setup as it is now allows me to take off from an international airport going in through a dedicated entrance, no queues, minimal security hassle - all it takes is a yellow vest. Alternative? GA is killed off and we're all off to Sleazyjet.
Again -in spite of what you think, the purpose of the "secure apron zone" was never to build a business coercing people to pay handling fees. Those businesses existed already since the dawn of time and didn't need our measly contribution to do well - the secure apron only came about in 2007 - 2008ish with the whole Schengen and secure borders hulabaloo.
For some reason it appears that you cannot even envisage that things can be different depending on location, without necessarily an evil intent of the government behind it. Building a handling business to fleece GA of our money? Ha bloody ha. That would work only if the powers that be were actually aware of the existence of GA.