I think thst has absolutely nothing to do with where you are from, it's often more to do with formal education as opposed to being self-taught, I find. The issue is one of guarding the blade and keeping your fingers a decent distance away from it (perfectly feasible with this process), something I believe that is emphasised to Union carpenters in the USA in their training as well.
Brilliant or no, logic dictates that the Laws of Physics will invariably overrule the "I've always done it this way and never had an accident" mantra.
That style of jig is well known and has been around for a very long time. Aigner have made a sophisticated (and expensive) adjustable angle jig of that type for more than 30 years, whilst Robert Wearing published a couple of DIY designs (including a nifty variable angle one which utilises planed softwood, a butt hinge and a locking quadrant stay).
Personally, I just cut them out of scrap on a sliding compound mitre saw - or a case of "when all you have is a hammer..."