Yes... and no. It is true that after a result is obtained, one could clean up the code for publication. And it is true that coding is not seen add first class at the moment.

At the same time, you need to consider that such a clean up is only realistically helpful for other people to check whether there are bugs in the original results, and not much else. Reproducing results can be done with ugly code, and future research efforts will not benefit from the clean up for the same reasons I outlined in my previous post.

While easing code review for other people is definitely helpful (it can still be done if one really wants to, and clean code does not guarantee that people will look at it anyway), overall the gains are smaller than what "standard" software engineers might assume. And I'm saying this as a researcher that always cleans up and publishes his own code (just because I want to mostly).