The non-rhetorical, pointless, software-dev answer? Because it’s another pesky item to have to manage in a humongous software project. That’s why documentation almost always SUCKS in companies outside of manufacturing. It’s a total pain. Devs like to spend 99% of their time on CODE. Documentation? Afterthought.
Which is why I SCREAM so much about a self-evident and SIMPLE UX. The smart way to write software? Make it simple enough that it basically doesn’t NEED docs. Unfortunately, that is a complete PITA for legacy programs like Cubase. But that’s where most of the things people dislike about Cubase lie… Stuff happens and you go WHY? WHERE? But because it’s some little dealie that one only encounters every 3 months, you spend an hour solving it, then forget it. Until next time.