> What I always appreciate about SO is the dialogue between commenters.

Stack Overflow is explicitly not for "dialogue", recent experiments (which are generally not well received by the regulars on the meta site) notwithstanding. The purpose of the comments on questions is to help refine the question and ensure it meets standards, and in some cases serve other meta purposes like pointing at different-but-related questions to help future readers find what they're looking for. Comments are generally subject to deletion at any time and were originally designed to be visually minimal. They are not part of the core experience.

Of course, the new ownership is undoing all of that, because of engagement metrics and such.