ofcourse: I agree that rigidity is a factor.
I think that many of the issues can be fixed. Each individual and each problem needs its own solution. I’m sorry to burst AZ’s bubble, but here is no one cure-all simplistic solution to solve the shidduch crisis.
For some singles mentoring would help, for other problems destigmatizing certain flaws. Some need counseling others need to focus on internal traits and compatibility rather than superficial prestige.
I think a multi-pronged approach can help many people, but there will always be, and always have been, some boys and girls who will never marry.
Narrowing the age gap will help few and harm many.