I design HVAC, plumbing, etc. for a living. 30 to 20 years ago, I used to do it by hand using calculators, pencil, paper, drafting tools, and specialized slide rule-like tools. First came fax machines, which meant you could fax questions and responses almost instantaneously, so you no longer had to think a couple of days ahead - so most people didn't. To get you started, the architect had to get you the background (paper or mylar "hard-copy") to draw on, with the building design more or less complete. Changes were a pain in the ass, which every understood meant you needed time and money to accommodate, so they made sure that plans were reviewed and approved before the design got beyond the conceptual stages. Changes did come, but they were few and far between, and you got paid to make them. Then we started using CAD programs to draw, which meant you could easily do things like erase, copy and paste, and slip in new electronic backgrounds at will. But, the architect could get changes to you at any time, and they started to do so closer and closer to the deadlines without thinking how it would affect other trades' designs. It's gotten worse every year, with the ease of e-mailing files, then posting large files to ftp servers, until now you often get major changes to the design a day or two before the due date. And now with Revit, much more detail is required to be input, most of which is up to the contractor's discretion, anyway. Revit also wants to automate a lot of the design work, but, so far, it is extremely terrible at it (even worse than most of those human designers that are bad at it). So my experience with automation-type "improvements" in my workplace is that they reduce some work loads, but encourage people to think less, and result in additional work that should otherwise be unnecessary.