The Soft Release?

That sort of technique may well work if you have a pre-planned release
altitude as on training flights in no lift. The time it takes to
recognize a thermal, and release in it, is far too short to reposition
the glider, pull up, push over, release, confirm release and turn. By
the time you have done all that the thermal is far behind you and your
chances of finding it are poor.

The only value for reduced tension release is to protect poorly
designed glider tow hooks. Like many things you learn in 2-33's it
should be discarded when you fly a sailplane.

Andy