On one hand, I agree with pretty much everything you wrote: anthropic explanations that actually work are very hard to come by, what I wrote sounds like the good kind, extending it to other physical laws beyond measure won't work.

On the other hand, I'd be very cautious to declare any question as meaningless. For now I withhold judgment on the issue of dolphins because I don't know enough. "Round manhole covers are round by definition" is correct, but not always complete.