So filtering/personalization is always present; we entirely agree on that point. Is it excessive, though? If it's not excessive, then, almost by definition[1], it's not a problem - or at least is not a major one. There is actually a huge difference between "personalization" and "excessive personalization", which was what I was trying to get at.
(Also, paragraph != sentence)
[1] Excessive meaning "more than is necessary, normal, or desirable".
A paragraph may legally consist of one sentence. It may legally consist of one word in some cases.
You seem to be trying to draw me into defending a point I'm not making. I'm making a much more subtle one, which is that you can't escape being in a bubble (not the bubble, which I initially typed, because there isn't the bubble, there's all kinds of them), so in a way arguing about whether it's "excessive" isn't even the right dimension to argue on; the filter bubbles simply are. (Not "simply ar excessive", simply are; they simply exists regardless of whether they are excessive or desirable or anything else.) The question is, what should be done about that fact, rather than how do we prevent that fact from being true, and to be honest I'm rather ambivalent about the answer to that question, because the answer is dominated more by your preconceptions and pre-existing goals than anything interesting.
(Also, paragraph != sentence)
[1] Excessive meaning "more than is necessary, normal, or desirable".