Why is that? No idea.
This sums up the value of the advice well.
Should a house be built with all sorts of tricks on a property where the square meter costs >1000€, but it is only a 280sqm towel, fulfilling a "favorable" house/land ratio?
All nonsense. And just because everyone else is doing something, you don't have to join in. Location is everything, and if you want to invest more money in the location than in the house itself, that’s understandable and perfectly okay. If I put a 300k house on a 500k plot, that’s my business—if I want to live exactly there and the budget only allows it that way, that’s smarter than giving up the location in favor of a more expensive house.
And why do others do it differently? No idea! Their own fault, their own stupidity.