Also, I feel it's worth pointing out to consider that it's also your opinion that Lego shouldn't sit on a shelf.
Fixing flaws in a set is only appropriate for someone who has multiple sets (and therefore the pieces to spare) and is happy to take them apart for MOCs - there are many people who bought the Chiron just because they wanted to build it, and therefore expect that for the hefty $600AUD pricetag it'll at least have stiff enough springs not to sag. If a new consumer doesn't have the extra springs to mod it, then they're sh*t out of luck until either they get reamed by Bricklink's shipping costs, or they spend extra money buying yet another pReMiUm Lego set that has the amount of springs they need to fix it. It's sh*tty product development and TLG should absolutely be called out for charging consumers a premium just to serve them a faulty product. It might be trivial to you, but not to others.
MOCing may be the point of Lego to you, but some people just wanna put together a sports car, excavator or whatever and have the satisfaction of it working as it should. It isn't utter lunacy to want that experience, especially when you're giving away $600AUD for that.
By the way, duh obviously there are courses teaching people to fix tube punctures - they're part of bike service courses. Like damn dude, there's different things that may not be immediately obvious when you go from zero mechanical experience to a full bike service. F*** anyone who didn't have your galaxy brain when they were six, and wants to know whether there are special tips for surface prep, and doing something according to manufacturing specs, right? How dare they take a course