> New Tweets that begin with a username will reach all your followers. (That means you’ll no longer have to use the ”.@” convention, which people currently use to broadcast Tweets broadly.) If you want a reply to be seen by all your followers, you will be able to Retweet it to signal that you intend for it to be viewed more broadly.
What if I don't want a reply to be broadcast in everyone's feed? (Not that it's private, but it's just not relevant and usually lacks context). Or are they saying that if you want it shown to everyone, retweet it and it'll show up to everyone?