I feel that light novel sites like Kakuyomu / Narou (where Sasaki was serialized) do not incentivize authors to do revisions much. Readers want new chapters to read and probably rate them higher than revisions. So authors write and write but spend less time going back and make sure things are consistent or make sense in the long run. They may make one major revision when the work is collected and published (like Tensei Slime), but they’ll also be under time pressure of a deadline in those cases (also like Tensei Slime).

It is not all bad; it ensures readers will have a huge amount of content to read continuously, unlike, say, more serious novelists who spends years meticulously making plot right before coming out with a single volume. But overall each title might be less satisfying and more prone to flaws like those you described.

Just off a tangent, Murata just voided several recent web chapters of One Punch Man manga and will be drawing completely new ones before they are collected for publishing. That is serious dedication considering each chapter takes many days to draw.