A lot of spell and ability names were taken from FFXI. Benediction is a healing spell in FFXI.

Also, Bene and Tetra are SIMILAR but not nearly the same thing. Tetra is up much more often making it more reliable in most situation. I use them in different situations (For example, Bene allows more free time to DPS than Tetra) and WHM doesn't need to lose any more abilities, so I would be royally peeved if they removed either.