Can I ask why did you introduce dummy late for your first?
I could equate using a dummy to the same thought process as breastfeeding.
While there are some parents that intend to use a dummy and bottle feed their precious first born child from birth, the majority of first time parents have a view of perfection for when they have their first child.
Most first time pregnant women think something along the lines of:
"My baby will breastfeed beautifully, will sleep easily without any props, self settle, I will be in-control with good routine and my baby will fit in with my plans perfectly. I will be the ideal parent and my baby will be perfect because I will not make any of these mistakes I read about."
So the dummy does not fit in with this plan. Therefore I think it is not unusual that a FTM will be resistant to using a dummy, it does not fit in with their plan for perfection. Just like failure to breastfeed, which many mothers face.
When you have your first child and become a parent, over the course of the first year you do your real learning. You learn that perfection is a pipe dream and impossible and that managing various aspects of (needless) guilt is par-for-the-course for a mother. Guilty because the mother feels she is not the perfect mother she wanted to be.
So why didn't my firstborn have a dummy early? Because I expected that I would give birth to Perfect Child who wouldn't need a dummy to get to sleep.
Suffice to say that my second and third all had a dummy from newborn. I suspect dummy use in subsequent children is inevitably higher because parents learn how useful they are with their first and so are less resistant to the idea.
My fourth (current baby is 7 months) was resistant to the dummy as a newborn. It took 7 weeks of persistence as she kept spitting it out and gagging on it. If I was a FTM I would probably have given up trying with the dummy, since it was being rejected. But by 7 weeks old she finally 'got it' and realised that sucking the dummy gave comfort. She was EBF at the time. No coincidence that within a week of accepting the dummy she was sleeping 11pm-7am without a feed.
From 4 months old I've been able to just put her in the cot awake (with dummy) when tired and she will go to sleep herself and without any crying at all. All night wake ups are also an easy case of leaning into the cot and re-inserting the dummy. Much better than pacing the floorboards rocking a screaming baby back to sleep - which is what we used to have to do with my firstborn.