I think there is an argument that automating tweeting leads to more spam even though there are some legitimate use cases.

The NYTimes automating tweeting a link to an article after its published provides value. Yet that same functionality allows spammers to tweet links to their spam automatically as well.

Likewise with scheduling, etc.

Anecdotally, before 2010 (when scheduling tweets became popular) I remember Twitter being much more active and discussion oriented, hence I paid more attention to my feed. Now i only use Twitter to search for specific things (ie is AWS down)

Those all are automated spam, and doesn't really facilitate discussion. They just increase noise on the platform.

Edit: Reminder that Twitter filters out posts that don't receive much interaction.

Pretty much none of what I use Twitter for is discussion. You're assuming everyone uses Twitter for a very specific, limited purpose.

Not everything in Twitter is about discussion.

Much of the platform is dedicated to users wanting to follow products, brands, services etc. For them the services I listed are a critical necessity. You can argue all of it is spam but then by that definition so is most of the web.

Lol @ you assuming that anything a company posts is spam. You can just unfollow them.