It's great when you can get away with that, but all too many companies (like where I work) have to deal with our customers as they are, not how we would wish them to be.
It's all the people like you who are the problem. If "use something standards-compliant or have a bad experience" were the universal norm, we wouldn't have these problems.
You say that like you think it's my decision to do this. I assure you, it is not.