APY- Simply put you are 100% incorrect.
We actually don’t even disagree, you also want close in age shidduchim as per your previous post.
Your issue is that you incorrectly think that enouraging close in age shidduchim which WILL lead to some boys getting married a bit younger and some girls getting married at 21 instead of 19 has something to do with being unproductive.
Your are entitled to your incorrect observations, and YES I will continue to promote the solution of close in age shidduchim that A. is working B. has been encouraged by a broad range of Gedolim and R”Y.
Not only that but the result that you are looking for i.e. that boys and girls willing begin dating at closer ages will actually be the natural result of the efforts being extended.
To date no one has ever encouraged groups of girls to delay dating. However, when it becomes commonplace for shadchanim to give more attention to girls who are 20/21+ and for boys to look for them l’chatchila, inevitable more girls will look to be productive when they come home from seminary in ways that even you would be please with.