That is not all people say though, plenty of people are like you and will bring up dropbox etc in response to that.

The important part is that HN isn't an echochamber, you get many viewpoints here.

I believe that all platforms with voting eventually become an echochamber. Unless they are partitioned into several smaller chambers, like reddit. Here the partitioning also exists, but is invisible (only some people interact with programming posts, only some with company posts, ai stuff, politics and so on), so that gives a certain "illusion" of many viewpoints. Illusion (imho) because I don't think those viewpoints interact with each other.