Bard? 16 for Otto's Irresistable is a huge bump there. If you are only going 14 bard, it is probably better to go a 6 splash PRE then a bunch of multiclasses.
14 Fighter / Ranger? 12 fighter/ranger and a 12/6/2 is almost assuredly better than any 12/2/2/2.
Again, if anyone can find a definitive example that is game-breaking, then I would consider the balance issue relevant. As it is, /still waiting, still thinking the "fun factor" of customized builds makes this a reasonable suggestion.
[Sidenote: Dev time is an argument that can be thrown at ANY suggestion as a reason not to do it. Seeing as how we generally have no idea how easy or hard a certain change would be, however, it is a meaningless argument for us to speculate on how easy/hard any change would be.]