The opinion monoculture is not specific to Lemmy. Most social platforms, and even real life social circles, live in bubbles.
The Internet anonymity combined with the upvote incentives only make the problem worse.
I agree with your complaint but I don’t see it as something that can be fixed. We can all do our part to engage civilly and respectfully with others, but it won’t be enough to change the culture.
I notice this much less frequently as time went on. Reddit had the same trend in Digg era.
Third party mobile apps can also implement this, it doesn’t have to be done in Lemmy itself.
Even posts with 100 upvotes and zero comments have value. It’s a quick way for me to see what’s happening without having to check multiple sources. The comments are just a bonus.
I subscribe to very few communities and only browse my home feed. It’s been great so far.
On my lemmy.world account I see no content from lemmy.ml
Call it OurSpace