Honestly, I would love the option, if only to see how dialogue is differed between the gender versions.
I mean, it's been about 2 years since the JP release for Atlus? Perhaps once they were considering to bring it on Switch, they decided to do some testing back in 2017 with Dev Kits to determine how they can do Persona 5 on the Switch. And that, this may of been that they have been developing the port for a 2 year period?