Education
Because players aren’t in a centralized location it’s simply harder to get educated on the deal. No one wants to focus on work when they are on vacation. It’s simply an issue of motivation. People want to relax, unwind, and not think about their profession.
Sure they NFLPA can do as many conference calls as they want. Players can reach out to their agents. The problem is if people are going to do that or if they are going to vote blind.
Maybe players vote because they saw a reaction on Twitter. That’s not a full education on the deal. It might happen though.