yea in belgium you don't have to go to driving school unless you fail your theoretical/practical exam 2 times. but you have to officially nominate one or two guides (can be family or friends, but they have to be experienced drivers) who will be registered on your provisional license and they're the only people you're allowed to drive around with until you pass your exam. if you take at least 20 hours of driving lessons you can apply for a provisional license that allows you to practice alone though.
honestly, i do think driving lessons should be mandatory but they're also super expensive so i kind of get it, at least those who can't afford it still have a chance too