One of the best things about trying to record the perfect take, even if it takes multiple takes to achieve it, is the level of playing you force yourself to perform at.
For example, once your take is on that timeline, you can zoom in and see just how accurate, or not, your timing is. Often you can't actually hear little mistakes <1>, but boy you can see them in all their painful glory. So you practise that section or phrase over and over again until you can play it to the level of accuracy that you deem acceptable.
In my experience, this is a level of accuracy that goes well beyond playing to a metronome - unless you record those sessions and then check back, in which case it's exactly the same thing.
I know I've said this before but I've taught myself how to play the sax by trying to record professional sounding songs. I've sat there for hours playing a single phrase or riff because I wanted it to be as rhythmically perfect as I could get it. And as the phrase has become easier to play, the tone has improved, too.
The funny thing is, if I look at a song I've recorded, such as Birk's Works, where I had to do a number of takes to get a single, solid recorded performance, that is somehow a less than honest portrayal of my playing (even though it's me doing all the playing); because of the hours spent trying to get that performance, I can now play Birk's Works with a speed and fluidity that makes that recording sound wooden and, on a couple of the runs, jerky.
<1> If you're playing to a backing track then the only instrument with any timing problems is you, which is why little timing issues generally can't be heard. In a real band, where everyone is playing at the same level, that culmination of little timing issues can be the difference between a pro band that sounds perfect and a pub band that somehow doesn't sound quite right.