I believe both Scribus and LibreOffice have had ways of doing embeded LaTeX for at least 10 years.
Sorry but you got to suffer Stockholm Syndrome or possibly only used MS Word if you think LibreOffice is nice to use. Try doing any kind of layout work in both LibreOffice and Apple Pages, and tell me with a straight face that you prefer LibreOffice.
I don't use word processors a lot. I usually write using Ulysses and sometimes LaTeX, but if I need a word processor it is because I need a lot of visual control which you don't get when writing latex or markdown. Pages is awesome in this regard, while LibreOffice frankly has little of interest.
Both LibreOffice and Scribus are stuck in the Windows98 era user interface paradigm and haven't moved onwards. A lot has happened since then.
It is an unfortunate sad reality of open source software. One just ads one feature after the other indefinitely with little attention to detail or overall design and usability.
Here is a little anecdote. A colleague struggled with figuring out how to do something in Excel. Software he had used casually for years. I suggested, try Numbers instead. He had no experience with it. But I knew that it has way better thought out UI. In 3 minutes he had figured out how to do what he had wanted, after wasting and hour trying to figure out how to do it in Excel. That is what good UI design means. Features are pointless if people can't use them.
Recently I watched a Microsoft presentation where they state that the many developers keep asking for features that are actually already in Visual Studio for several versions.
One case where they tried to improve this was to make a little clickable arrow on VS 2017 to make "run to cursor" more visible, a feature that is there almost since the early days, but requires the use of toolbar or context menu.