It's still yet another proprietary filesystem, which the world does not need at this time, sorry.
As per Wikipedia:
Notice that very few things actually supports exFat so far. I have yet to encounter a single device that did support it.
As per Wikipedia:
Microsoft has not released the official exFAT file system specification, and a restrictive license from Microsoft is required in order to make and distribute exFAT implementations. Microsoft also asserts patents on exFAT which make it impossible to re-implement its functionality in a compatible way without violating a large percentage of them.[13] This renders the implementation, distribution, and use of exFAT as a part of free or open-source operating systems or of commercial software, for which the vendors could not obtain a license from Microsoft, not only technically difficult, but legally impossible in countries that recognize United States software patents.
Notice that very few things actually supports exFat so far. I have yet to encounter a single device that did support it.