Think it's more about having to formally meet some kind of "build approval" for every piece of work, instead of just going - "Yep, these nominated people are deemed competent to do whatever they feel is required". It's the whole legal minefield of possible injury lawsuits from numpties - the Karens that like to rip out the "Just because it said "
Skilled, experienced riders only, full face helmet and body-armour recommended" I want to sue because I grazed my knee when no-one stopped me riding my K-mart step-through rigid city bike down the trail. I'm clearly an experienced rider because I rode 2km on a rail-trail once and the track should be made less dangerous to accomodate more riders safely".
Rather than the "Fuck, that hurt! Probably should've walked that first..." types we have here on RB.