T1 transmitter messaging

The new T2 transmitter seems to be aimed at divemasters/dive schools overseeing dive groups, the T1 can already recieve info from another dive tank, 2 total including own tank

will messaging between dive buddies be facilitated through T1? i have zero need for the extra tank monitoring the T2 brings

Has the T1 transmitter been discontinued? There's no price listing on the UK garmin website, though it appears on US site