I was texting a friend about this a few days ago. I do think Rod the Bod is overrated. He's a good coach, but not like "best coach in the league" level.
His teams play the same way every season, make no adjustments, and then they get bounced the same way every year. He's gotta change, but he won't.
His teams perform well because he is a good motivator and gets maximum effort on a consistent basis. But working harder isn't a recipe for success in the playoffs. Every team is working harder. That edge they had in the regular season doesn't exist.
Again, this work ethic and high pressure makes them very effective in their man-on-man defensive system, but in the playoffs, it's not sustainable. Teams are better, and when those breakdowns occur (your man doesn't take his man), the more skilled playoff teams pick you apart. And that's what happened.
They need to get more shot quality. Despite a massive edge in shot attempts, the Rangers led the series in xG (per SportLogiq, which includes passing data). It's not a coincidence they keep getting "goalied" or "unlucky".
These are all issues that were evident for years, with minimal adjustments made by RBA.