I only use it so my climbing system can be placed above my chest box. That way i don't even have to hold myself upright as I'm top heavy. It's also good for ddrt hip thrusting, you just pull the tail and it winches you up.
Edit note: most full on rope walker setups you see use only ascenders, and so they have 2 life support tethered ones because you can't trust a single ascender for life support. I run a foot ascender, a homemade knee ascender that i clip onto the chest box (longer so the bungie works better), and use my climbing system as my sole life support. Since you absolutely must have your life support above the chest box, an adjustable bridge allows me to do that instantly.
Once I'm where i want (or if i need to rest, sit in harness to inspect something, e.t.c) all i need to do is sit down and I'm in my climbing system. I can remove ascenders and rappel immediately (wasp encounter or the like), just reaching to face level. To switch to normal length working mode bridge, i sit down, unclip chest box, then stand up and pull slack on the bridge, then I'm good. It has seemed to be the easiest and best solution to that, because since I'm top heavy the chest box makes a world of difference. Hands free climbing a ladder, where you can push off limbs and other stuff while going up. I often gently use my hands above it, but it's mainly just out of habit and they don't actually do much. For shorter accents I'll forgo the chest roller, but if I'm getting tired it's there.