Why do many Mussarniks discourage Yeshiva boys from getting married during the month of Ellul? Because it harms the yeshiva spirit they believe Ellul should represent (not this, either). In some places, they go so far as to forbid friends from attending the wedding.
The Chazon Ish famously disagreed, approvingly calling such timing “grabbing more mitzvos before Yom Hadin“.
There are multiple angles to explore here: Establishment\individuals, dis\regard for holiness and marrying early, un\faith in people, bare authoritarianism, Torah wisdom\”Mussar“. And (especially in yesteryear), I can see a problem of שמא יקדימנו אחר.
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