Okay then to get back to the core of the issue and summarize: if you don't want to use something - a feature, a piece of software, whatever, then do not use it? It really is as simple as that.
I was saying that PieFed offers additional capabilities beyond Lemmy. If you choose not to avail yourself of those, that is entirely your choice, and I support you doing whatever you like in that regard!:-) But so too should others have the identical freedom. I am not debating that places such as 4chan (where anything and everything goes) may have merit or not, just that the subject under discussion was whether "Didn't piefed came with built-in echo chamber features", to which I was saying yes sorta but mainly no not really.
Mods on PieFed have one additional option beyond what Lemmy mods have: the latter can only "remove content" vs. "not remove content", whereas PieFed mods have a more middle-of-the-road option where they can choose to not remove content far more often, trusting that the automated filters will remove the content only for those users who have indicated their preference to not see such, rather than force a choice that affects all users one way or the other. To me that sounds like the literal opposite of the "echo chamber effect", from the standpoint of the mods, even though yes users can surround themselves in such a bubble if they so choose.
As too they could under Lemmy as well, requiring a bit of effort to block many users but it can definitely be done, whereas PieFed provides the option to use community-based moderation to achieve the same end, and in the process affects each item of content individually, while allowing users to not have to block other users, and thereby all content from them, to achieve this effect. e.g. I could see an icon for a highly contentious user who receives 10x more downvotes than upvotes, and choose to ignore that fact and respond anyway, or else be more measured in my response, or just read it and continue scrolling.
Think about that last option: I would be able to read the content in this scenario, even if I chose not to respond, whereas if I block the entire user account then I will not even see it in the first place? Blocking is a heavy hammer, whereas user labels are the gentlest of informational resources. Lemmy provides ONLY the option to either block vs. not block, both to mods of communities as well as to individual end-users of one another, whereas PieFed provides many alternate forms of nuance via tools that the users can use, or yes abuse, as they so choose.
More choices = freedom. More exposure of content is the opposite of an echo chamber effect. PieFed provides more choices to allow for more exposure of content than Lemmy does, which only offers the removal/block features without the nuances that PieFed allows for.
I presumed too much, my apologies. I thought you were talking about the "echo chamber effect", which is a topic of much contention among people who discourse about social media platforms. If you were simply saying that people like what they like and do not like what they do not like, then yes, that much is true - although in that case I am not sure why it needed to be said? - although even there, PieFed allows for more options to moderate such than Lemmy does, while remaining the same in other ways. But I am not trying to push you into anything that you do not want to know about.