The "balance" is based on something that, while explicitly stated, you somehow disregarded: that some--and, by and large, the current legal landscape--considers the freedom of speech right of the platform to censor people, and so to obtain "anyone can say anything" we have to take away "the freedom to not say something"... which we actually already do in various instances (often involving protected classes) and so, personally, I consider that to be a tractable goal to regulate: some things are "utilities" or even "quasi-governmental entities" and should be forced to be something like a common carrier.