Lanefan
Victoria Rules
Exactly the rationale used when we did away with that rule and made multiclassing work pretty much the same for everyone. Such restrictions as we still have are based on class rather than race, with the proviso that some races still cannot be some classes at all.Bob, the 5th level fighter, becomes a 1st level cleric. Fortunately, he thought ahead and bought weapon specialization in mace. However, now that he's a cleric, he can no longer gain any of the benefits of being skilled in a mace. In fact, he's so poor at it, his Thac0 has reset to 20!
Its like becoming a Math major, switching over to learn chemistry, and forgetting how to do Calculus!
On a broader scale - and not really related to the previous paragraph - one thing that's slowly becoming clear out of the murk is that designing a system with solid internal logic all around (rules to fluff to gameplay to believability; no edition has yet hit all four) would go a long way to bringing back the disenchanted.
Lanefan