Wow it's a substantially different experience with most that i've been across here.
Almost every subbie I've met even those building residential properties have a few mobile apps for doc management and so many ipads for plan review\access\defecting
The last plumber I worked with had the quote in my email with updated pricing and online billing before they got back to their ute.
You're Australian I gather. We're far ahead of the curve.
People who haven't used change control have a hard time imagining what they're missing.