Not every gank has to end in a kill

{quoted}

I'm talking more about those junglers who won't gank because they feel like they can't grab the kill. Like they won't gank mid because it's an enemy Fizz or something. Just the pressure of a gank can help.

There are times when it's smart to not gank a lane and hope that they can do fine on their own (Fiora, I'm playing a jungler who can't gank effectively until level 6 and you were 0/5 into a Riven by the time I hit 6. If I gank you, she double kills us and there's actually nothing anybody can do to save you. Farm under tower and let me scale up to the point where I can at least tank her damage for a bit and then I'll come top and try to help you. -Actual conversation I had with a Fiora on my team while I was playing Skarner)

Not always true. If he escapes without blowing anything important and jst walks out all it does is build him up, give him confidence, remind him future ganks may come and waste your time. Plus a lot of laners then assume incompetence or go way too hard on an impossible gank. It is a measured art deciding when a gank will have a net positive for your team. Though I agree with the premise it isn't as simple as gank = good.