Take it from a guy that has taken multiple CBT exams and passed......it's not overly difficult to find what you need using the digital codes they provide. trust me, I thought it would be, but if you have a slight idea of what you need to find, you can find it easy, i promise!
I can see your point about searching through the codes quickly, but if you are not extremely familiar with the document, there can be nuances that you miss. As I noted, I have these highlighted so I don't overlook them. Also, I created numerous flow charts and step-by-step summaries for various operations to help prevent missing a step that could be critical. I know of other folks who have created design aids for various equations, constants, etc. that I assume now will be verboten.
Also, the 800# gorilla in the room, how does this change affect educational firms such as AEI? I know that they put a lot of effort into their books and summary sheets. I am assuming that examinees will not be allowed to bring these materials in.
All-in-all, not a fan of not allowing test takers to bring their own reference documents. Its already open book for crying out loud. What can people bring in that constitutes cheating other than video or access to the internet?