I love how everyone is like "it doesn't matter, you know what it means"... like, that's not how language works. If I spell "cat" as "gas" that's wrong BECAUSE IT'S A DIFFERENT WORD. If you don't have the eszet, write "scheisse". It's that easy, otherwise you're not even saying "shit"...
Well, not everyone has access to the ß. If you have any type of Apple product you can get the ß. So, if you have Windows or something else you can just type b,B, or ss. If you know what it means, it shouldn't matter.