This is pretty much why I enforce the templates in my current GURPS Dungeon Fantasy game:
Every PC Is Expendable, or, Why We Template
I wouldn't say it word-for-word the same way, but the sentiment is the same. Even the reason I don't bother with variant clerics is the same - too much detail, too much "find the god who gives you the cool spell combos" and not enough Good vs. Evil. You get guys who are good at their specific niche, don't stomp all over the utility of other player's characters, and who narrow down the options enough to give you real freedom of choices while preserving the GM's ability to focus the challenge.
My next game may be template-free, but this one isn't for those reasons.