One subject that I talked about very recently is the fact that, without rookie minicamp, rookie free agents and other first-year players will, at least for the time being, not have the opportunity to try out for teams in an attempt to make the offseason roster.
Under normal circumstances, the Pittsburgh Steelers would hold their rookie minicamp two or so weeks after the draft, and in addition to all rookies and first-year players on their roster, they would have a large number of players who are participating in the weekend on a tryout basis. Almost every year, one or two (or more) of them would be signed to the 90-man roster.