Why use a link aggregator over an image board?

I've been browsing Hexbear and noticed that while it has some discussions it mainly has an abundance of memes and visual content. While the link aggregator format is great for discussions and text posts, I can't help but wonder why not use an image board like Leftybooru. Image boards offer the advantage of easily finding images based on tags, whereas Lemmy lacks this feature. So you can never go back to an image you liked unless you remember something said in the post. On the other hand, Lemmy does allow for better organization of discussions through comment trees. It seems like a platform that combines the best of both worlds would be ideal for the Hexbear community. What are your thoughts on this? Is there a reason why you haven't adopted a more hybrid approach?