scribus can very well work with documents coming from libreoffice.
but you can't import layouts, just content and some basic formatting.
why is it this way?
just think about the most striking difference between write and scribus: scribus has pages, write does not (of course, write has pages too, but they are created automatically, and are not really in your control).
or how easy it easy in scribus to mix text flowing in a custom way from page to page with images that are placed at a fixed position. and what a struggle it is to do the same with write.
on the other side, if you need your images to flow with the text, it will be easier to do so with write... (but, then, you're not in control of the result)
all in all, if you have a simple layout in write, scribus could "easily" automatically import it. but it would also be easy for you to redo the layout in scribus.
if the layout in write is complex, scribus will have a hard time recognizing all the small details and you will need to check everything twice and make sure that nothing is out of place.
at the end it's probably easier to recreate the layout correctly.
also, scribus offers many more manual customization features for the layout that make it worth to work with it. if you don't use them, you can stick with libreoffice. and that's more than fine!
if you want them, you can try both and see what best fits you.
if you need them, you don't have the choice: you will have to learn how to use scribus.
while the integration of scribus and write can for sure be improved, you need to understand the differences between the two.
and forget about the idea that one is better than the other.
they are different tools, for different tasks.
even if for some tasks you can use both.
there is no sharp separation between the two, but i hope that it's getting clearer, what the differences are.
ciao
a.l.e