Yeah the thing with clamping it's not for everyone, and tricky. Yes it can be dangerous, and when I started it nearly 20 years ago ? nothing like 5x5x3 existed.
This isn't to say clamping is dead, it's effective but allot of guys just can't execute it to the desired safe level due to its risk factor.
I gained huge with it, but I also had scares in the early days with it.