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But isn't askphilosophy a place where even less academic people are able to comment their own view on subjects without having to research and supply evidence
By and large, no. In principle, yes. If someone with no background in philosophy is able to post a suitably coherent and subtle comment, then that is fine. Usually, this is exceedingly rare. As in most "ask" subreddits, we're not looking for uninformed opinion any more than askscience or askhistorians is.
How can new ideas be formed if we just repeat old ones?
This is to misrepresent what is being said. We form new ideas by being familiar with what came before -- by seeing what works and what doesn't. No one has to reinvent general relativity in every askscience comment. Similarly, in philosophy, we have the luxury of working with the theories that came before us -- seeing their problems and insights. So, it's not mere "repeating."
There's nothing here!