Ideally posts and comments are somewhat in a relationship. For a community with little traffic, posts will occur scarcely, and few subscribers will add and read comments in their time.

If the community has few subscribers but many posts, any commented posts will be scrolled down so much that engagements stagnates.

So yes, you are right. If a small community has a single human poster who posts all the time without commenters engagement, it’s the same problem.

But a bot almost guarantees that any community it posts runs into that situation. You can’t automate human engagement.

And if you comment on a organic post, at least the original author is probably gonna read it. Engaging with a bot post is just wasted time typing something out that noone will ever read.