Having only experienced small little locks, I'm wondering how much turbulence and current you get in the locks there.
Our small little local locks are very tame, and I don't bother tying off. It's easy enough to give an occasional forward or reverse thrust if required.
I expect these locks with a big vertical differential would be moving a fair amount of water.
Wifey B: Several different chances at turbulence. The first is when you're inside and water being drained or filled. Every lock slightly different, some do it faster than others so more turbulent. Also, varies based on where you are in the lock.
Then there's the chance of a commercial tow in front of you. Their engines at close range give you a lot of turbulence. If you don't stay tied and let them clear then you may get bounced around inside the lock and hit something.
Then there's the wind and current when the doors are opened. You've been in a protected cocoon. You might have been 80-100' lower and shielded when you entered and when the upper doors open very different conditions.
Then one last thing to be ready for. Ever walked from 8th to Broadway in NYC on W 56th St.? No, probably not. Well, on a windy day, you step out beyond the building on the corner and you might do a Mary Poppins. That can happen when you pull out of a lock. You're protected, then you're in a wide open space with a strong wind you weren't prepared for plus current and other boats.
Now, some locks can be wild and you do have to look out for people who have no idea how to operate a boat inside. Think of people who can't dock and then put them in this big room with you. I was in one on the TN river and the lockmaster told the pontoon boat to tie on their starboard side, to pull forward, and soon they were floating across so he said "port side, forward please." Well soon the boat was facing the wrong way and the guy about to tie and the lockmaster had to explain that wouldn't work when time came to exit. He had him tie to the bollard and then use the engine to swing around, then re-tie. The entire thing was like 15 minutes. One other boat said something ugly over the radio about the pontoon and they got in big trouble with the lockmaster. Lockmaster patient with pontoon but not with misuse of radio.