That's the thing, I am not so sure. Like ask for what the reason behind that discomfort would be and a lot of the time it still has it's root in other people's perceptions. There's a lot of muddling factors, internalized misogyny and the need to project "manliness" as a distinct comparison is still basically an external training to feel that way about that feature. Things like fatphobia work off of external training to social body standards and a lot of that dynamic is at play in cis spaces...but doesn't well graft one to one with the trans experience of dysphoria /euphoria.

It's a difficult knot to dig down to it's source but I think it's a way more of a distinct difference of operations than people think hence why it's so gorram hard to explain to most people what is going on.

To confirm this would require a bunch of study which isn't really happening because cis people don't really deeply examine or know where to start even into exploring what being cis actually is. They don't really have to think about it. The only reason we trans folks have to do so much introspection is because we can't just be left to do what we need. We have to quantify it and examine it to self advocate... And then when cis people render our situation back to us in completly dismissive nonsensical ways it prompts one to wonder. Maybe there really is a physical difference, some chunk of development that created an inflexibility where normally there is flexibility. A trans brain might exist in a subset of cis people and align internally (I have definitely met folk like that) but unless cis people talk to each other we might not be able to confirm.