tldr:
- no contact practices hurts WRs and how they can practice combating press coverage
- coaches are worried about installing the playbook so individual drills suffer
- OLmen from college spread offenses, WR route running, tackling are areas affected
- players that are considered physical freaks, but are raw, don't get proper development
- late round draft picks that need coaching up suffer from less practice reps/time
http://espn.go.com/nfl/story/_/id/16370346/nfl-offseason-disaster-rookies-players-roster-bubble
(snippets from article)
Rookies still need reps in press-man (hands, contact), tackling drills in the open field (come to balance, square up, shoot the arms), one-on-one pass rush and so much more. That's excellent work in the offseason and vital for rookies. And you can do all of that in shorts and helmets with smart, effective coaching.
But with such limited time on the field and not enough reps in true competitive situations, rookies aren't getting the correct orientation into the league.
"Things get left unresolved after practice," the coach said. "Guys aren't allowed to get better."
Think of the players who come into the league with supreme athleticism but undeveloped skill sets.
OTAs are now used to teach the basics. That means installing the playbook is the priority for position coaches. You can't play unless you can line up, right? But that has created a league more heavily invested in alignment and assignment than technique and execution with rookies.
Added another coach with NFL experience: "No question the new rules inhibit your ability to develop players over time. The late-round guys and free agents are really hurt by these rules. So, in turn, the depth of all the clubs continues to suffer."