I wouldn't even say the changes WotC has offered up in the playtests thus far were all that radical. A lot of them were just window dressing in my opinion.
To me... any change WotC made that could be reverted by a DM by just using the 5E14 rule instead could not be considered a radical change.
To me... any change WotC made that could be reverted by a DM by just using the 5E14 rule instead could not be considered a radical change.