My limited understanding, of what to do with TE ritual ...
(1) ... say you have a Weapon
(2) ... that doesn't work with Rain Of Blows
(3) ... and you do have a weapon, that does work with ROB, but you want the "bad" weapon's modifier thingy on the "good" weapon
(4) ... this ritual solves that problem
As usual, it gets cheap around 8 to 10 levels later, after the level of the ritual.
I'd rather have the Consult Oracle ritual, and plan a little better.
But a DM can screw up any plan, and TE ritual, is a way around a difficult DM.