We don't know at this stage whether the standard Fedora or Debian SD cards have LibreOffice included or not.
Or indeed any of the other possibly distros, but it doesn't matter as it will most likely be built for that distro for the Pi and it will be a simple matter of using your package manager to get it. On the other hand, options for alternatives are limited.
But despite this, my understanding was that the whole mission of the foundation was to move away from teaching Office suite and have more focus on programming and hardware development. Google Docs, Zoho or Office 365 are just as viable in the Office suite category. In fact probably more so. It seems to me that this stuff will move into the cloud in the next few years anyway.
Well, those can be a bit heavy in the browser, I have not tried office 365 on Linux (but will) and some (Well at least office 365) cost money. On the other hand, having an office suite does not imply it is there to "learn" it can be there just to use.
I doubt that many businesses are using LibreOffice right now. I'm not doubting that it may be a useful tool. You might use it to write up your homework.
Most businesses aren't. That said most are using Microsoft who appear to be complicating their licence model so you never know what will happen in years to come.
I do use Libre office (a fork of Open Office) as well as open office and both are as good as Microsoft office for what I use them for.