That's only true in specific parts of Europe. Where I am renting is like the wild west. Last year a friend's landlord put up their rent by €100, after 2 months

That's only true in specific parts of Europe. Where I am renting is like the wild west. Last year a friend's landlord put up their rent by €100, after 2 months of their 1 year contract... But your point still stands, here you would typically buy a property when you get stable in life, locking in a monthly payment with a mortgage. Towards the end of the mortgage the payments will feel a lot more affordable due to inflation and / or a higher salary from career growth. If you keep moving to different places that's going to be complicated.