If you are a little off center it can be fixed in post to make the levels about equal.
I don't think that's the point. If it were strictly a level issue that can be corrected in post, then there wouldn't be any point to all the different mic configs (DIN, DINa, ORTF, etc). So, while I'm no expert, I do want to point out that it's not strictly a level issue at play but how the sound interacts with the spacing between two microphone capsules to provide a sonic image that hopefully replicates what you would like to hear in the recording.
For example, spreading the mics into a DIN configuration suggests that there is slight time delay between the sound coming from, for example, the right stack to the left mic vs. the delay from the same stack to the right mic. This approximates the distance between our two ears, so in theory at least, this 17 cm DIN mic spacing replicates what we hear when we are standing out in the crowd. This has nothing to do with bumping the level of one channel, but everything to do with the one or two milliseconds (or whatever the lag is) time difference for sound to reach one ear versus the other...or in the case of recording, one capsule versus the other.
So, this time lag is one aspect at play in recreating the authenticity that some of us are after when we tape live recordings.
On the other hand, for coincident setups, the sound reaches both mic capsules at exactly the same time. What I've read is that some people say that their recording 'loses space' or 'loses depth' when they record in coincident...although since I'm still learning, I'm not real sure what is gained with coincident...maybe better stereo imaging (versus 'live sound recreation').