When we flew to Vegas, I checked all of my gear because I didn’t want to hassle with security. Pete brought a few pieces of hardware on his carryon and the TSA agent at the X ray machine asked “Were you climbing?” Of course that was in Vegas on the flight home.
This couple took all of their climbing gear on the plane from MSP (I think) to Vegas and had no problem.
I think I would still hesitate to carry on all my gear. I just think it’s less of a worry. (But then, I get one checked bag for free.)