1) The top value (319 mph) is far more useful than "more than 200 mph." It is apparently quite accurate, at least based on what now we know. Might there be a peak gust of 325 somewhere? Sure. But, 319 as a top value seems close.
2) The Rozell, Kansas, tornado would be rated:
F-4 (measured winds) AND
f-2 (estimate from damage)
People doing a database search would be free do an "estimate-only" search and it would appear nothing has changed. Consistency would be preserved. Building designers could do a search by wind speed and retrieve much more precise information.
3) So much work was done with the original Fujita scale (Tom Grazulis "Significant Tornadoes", and others) we would not have to go back and re-rate the tornadoes prior to 2007 to accommodate changes in EF or some third index.
It seems to me this has huge advantages and no downside.