I actually like knowing that what I see is the same as what other people see. Among other problems, it's hard for a site to cultivate a consistent culture if everyone has their own filter bubbles in it. I don't mean to rail against customizability completely, but I see what's basically "just let everyone make their own filter bubbles" brought up way too often as a one-size-fits-all solution for culture problems on websites with the downsides almost never brought up.

There's been a few times where I was a heavy user of a small filter-bubble of a site, recommended the site to others, and then later realized most people associated the site with certain kinds of content or idealogical positions (that I had avoided in my unique view of the site). That can be uncomfortable.

As a much more minor and kind of silly case: there was a forum I was a very long-time user of, and it had an old-school visual design that I somewhat associated with the community. I expected that other users would easily recognize screenshots of it or even things with a similar color scheme. I wondered if the old-school design of it influenced the community and had considered writing something about that if I wrote about site design. Then one day I visited the forum while logged out. It had a much more modern and conventional visual design. It turned out that a new theme had been made for the site many years ago and made default only for new users which now made up the bulk of the community. I felt uncomfortably solipsistic to learn that after so much time.