Fun fact, if you took Kaiten off your bar entirely and just spammed Shinten with the Kenki, you'd only lose about 2.2% dps on average. You actually never had to press it.

The ability only really matters for high end optimization and week 1 Savage prog, but players who probably barely dabble in EX are happy it's being ripped away when its existence doesn't even matter to them in the first place.