I could play on a 10 second clock until I get to the green LOL...and probly a 15 second clock on the green 70% of the time...but there are some putts that take time to figure out...
IMO a 30 second clock is an excuse to play average rounds...it will bring the good players who calculate everything on every shot down to the level of players with less ability....
Now if both players are equal and just want to get a quick match in I see nothing wrong with it, but I have watched several of icons matches on Twitch w/ a 90 second clock, and they seem to be having fun...I don't see anyone waiting around for the other guy and they are all good players....
JMO