Gefen +1.
I think R’ chayim shmulevitz beleived that there was no necesuty for histadlus AT ALL in shidduchim, explaining that it is the last area in which yad Hashem is still clear.
I think that he also explained the famous gemoro of ???? ???? ??? ?????, ???? ???? ????? that since those two were concerning a shidduch, it was simply impossible to mess up.