It's the same story when it comes to the EPUB's place within the wider digital publishing ecosystem. Previously seen as a limited format compared to other files such as PDF, increased support and infrastructure now makes the EPUB ideal for a wide range of digital publishing projects or workflows.
Similar to how writing code directly produces a better EPUB than software, customised use of open source software produces better conversion results than expensive off-the-shelf systems. This last download is fully interoperable and gives you a bit more information about the EPUB and its extensive ecosystem.