I Was listening to EA podcast "Hear This Idea" about biorisks and one thing they stressed was the importance of running the numbers and assigning probabilities and weights to components of a decision as these estimates can often make the difference between what is most effective.
Many posts on the EA forum contain many ideas(example), of which maybe you disagree with specifically one minor point of it. This disagreement may likely only be 5% of the reasoning to support one side of a hypothesis(ex. EA culture may be too big). Maybe because it is such a minor nitpick, and they may have many small minor nitpicks in a few various places, they may not comment at all due to the effort of having to provide the context of each scenario in their comment(such as if they wanted to comment on a line "Thanks for your anecdotal experience, but my experience differs..." or "I think this point was also articulated in [other community builder]'s post about their experience +1")
This may not be a big deal if we lose out on one person not weighing in on 5% of the reasoning of a position that has 80% confidence in sum. But if a few people each weigh in their 5% that 80% may drop to 65%, which may change the action that we end up prioritizing as it may be only worth it if it is at least 72% correct.
A reason why this may not want to be implemented is because it may be hard to read an article for the first time while the comments are present. Maybe by default inline comments can only be enabled when you reach the end of an article your viewing for the first time(in addition to a button at the end of the article/before the normal comment section to enable/disable inline comments manually). On aesthetics it may not be too big of a problem as I think people generally think google docs comments are well made. Although would love some others to weigh in on this.
Disagreements are interesting, even if minor such that they don't think the conclusion is wrong, but just think the confidence given in the conclusion is too high and think the conclusion should be more weekly held. This software upgrade may provide help to facilitate that.