Anything to protect players from further head injuries is fine with me. I know that some "old school" fans are complaining that it makes the sport "less tough". The players playing today are faster, stronger, and quicker than they were even a decade ago.
https://www.espn.com/nfl/story/_/id/40031598/nfl-allow-guardian-caps-helmets-regular-season
https://www.espn.com/nfl/story/_/id/40031598/nfl-allow-guardian-caps-helmets-regular-season