Nvm. I thought about this a bit more and think I answered my own question.
I think the situation the clamps could address is pressure fluctuations.
The sequence :
1. Hitting target boost
2. Sudden and momentary boost leak
3. Boost controller tries to compensate, IE: wastegate closing
4. Overboost / boost creep
5. Repeat from Step 2
Still makes me wonder if a tune without clamps can fix this.