Photoshop, PDF and Excel are all products that were truly much better than their competitors at the time of their introduction. Every file format accumulates c

Photoshop, PDF and Excel are all products that were truly much better than their competitors at the time of their introduction. Every file format accumulates cruft over thirty years, especially when you have hundreds of millions of users and you have to expand the product for use cases the original developers never imagined. But that doesn’t mean the success wasn’t justified.