I was like you but then I read
Switch to LibreDWG #1055 Response, including all the links.
That's not even the problem. Somewhere I read the dwg format changes regularly and it isn't documented. So dwg compatibility is probably a bigger job that LibreCAD itself. The real question is:
Should LibreCAD offer dwg support? It might be better to drop it and have a reference in the manual to use a third-party program to convert it.
In my experience, the only company to do full dwg support is Autodesk®.