Considering that SJWs consider everything that disagrees with them as "harassment", you lose a lot more. You lose the main function of Twitter: The exchange of expressions of opinions.
Twitter could have been the proverbial "marketplace of ideas", where people can offer their point of view and by approval and disapproval we could have seen the true opinions of people visiting, unblemished and unencumbered by peer pressure, due to the general anonymity of the medium. Yes, that does mean that you get to see the radical and even the mean side of society, but if that is what you see, this is what we are.
We might not want to see that, but if this is what such a place ends up to be, it does mean that we are down in our core radical assholes, moderated by a society.