One big issue that Lemmy has because it's a distributed service is the dilution of results.
For example, there is only one Reddit domain (that people use to access the service) but there are hundreds/thousands of Lemmy domains and the dilution will continue to increase as Lemmy's popularity increases. It's either that or there will only be a couple of Lemmy instances that will dominate all of Lemmy.
You bring up an interesting point. There are opposing opinions on everything if you go deep enough into the topic, even in STEM fields too.
It'd be interesting to see a Wikipedia that provides pages on the same topic that present each opinion. So the base/overview page on the topic states the summaries of each opinion with a link for further reading. Each opinion page states there are many opinions on the topic and it just presents one. Each page then suggests for further reading, view the base/overview page where the user can read about other opinions on the topic.