Honestly, I can see both sides of the debate, that is, the Prime Directive as applied in TOS and as applied in TNG.
I would speculate that by the 24th century, the Federation revisited the idea of the PD, perhaps as they might have by that time evidence that interfering with pre-warp civilizations wasn't a good thing.
One thing I do recall: Not once do we see Kirk throw up his hands and say, "Well, we have to move on. The Prime Directive means we have to pull our stakes up and go on the next mission." So it seems to be the PD was always being interpreted in favor