The fidelity issues are still there if you are loading Microsoft formats into LO. All the Microsoft format specificions are a insanely long, complex messes that even Microsoft doesn't follow, so I suspect that will always be so. But Office now read/writes ODF files, so you can ask it to convert into something LO is the authority on. That also means you can send an office user an ODF file, and expect it to be displayed sensibly.

So the friction is still there, but it's a lot less now.