Even people who aren't on Trello can follow along with key discussions—set up this Flow and we'll handle everything for you. It will then trigger with new comments on Trello, posting a new item to your custom RSS feed for each one so you can rely on all the visibility into your work that you want to set up.
RSS (really simple syndication) is pretty much the industry standard for feed readers. You'll find RSS feeds in almost every app imaginable.