It's sometimes difficult to believe how much misguided logic is put into input validation. Addresses which must have a street and a number, middle names not all

It's sometimes difficult to believe how much misguided logic is put into input validation. Addresses which must have a street and a number, middle names not allowed, valid postal codes not recognized or auto-filling the wrong town, arbitrary maximum length for street names, and I could go on. We programmers (or we product managers?) invest way too much time in nonsense.