Most of the source clients still use the Shoutcast v1 protocol anyway (when connecting to Shoutcast v2 stations)
The real reason why we chose to say "use the Shoutcast v1 protocol" is to avoid confusion:
-If you're going to use a DJ connection (so a live connection while the autoDJ is running), you will have to connect through Liquidsoap, which only accepts connections made with the v1 protocol.
-For live broadcasts where the autodj is not running, you can use the v2 protocol, since you're going to be connecting directly to Shoutcast and obviously Shoutcast v2 accepts connections made using the v2 protocol, but you can also use the v1 protocol with no problems.
The thing is we thought it might confuse people if they see "use v1 protocol" somewhere and "use v2 protocol" a few lines below. So we decided it would be best to just use the v1 protocol everywhere