Daemon! Learn to use the multiquote!
lol

But in response to your question:
Outside of Abyssea........... why would you want to keep your TP?
DDs main the most potent weapon they have.
Mages aren't gaining TP so their switching their stat-sticks won't change anything...
And..... um.... PLD?

I just can't think of any situation, outside of trying to red-proc in Abyssea, where a weapon switch is something that is... well.. needed.
And even then.... it's more of a "well I don't have to worry about this joke scythe's 999 delay"....