ATC and auto lock work fine for repelling (I don’t have experience with them but have used a figure 8) but they don’t work for ascent. It’s nice to be able to go up and down on the same system without disconnecting. With something like the grigri or petzl rig or similar SRT device you have some more flexibility. You can climb, set up, swing out and trim a couple branches, adjust your platform, etc moving up, down, or out as you need and then back to your hunting position. Of course you want to move around as little as possible but the flexibility and ability is nice. It doesn’t weigh much.