A practice is dissident when it is not allowed., Rome itself has allowed girls to serve; and girls serving has yet to be shown to exclude boys.
CARA reports that 80% of those ordained served; and since 20% didn’t, there is no showing that not serving will prevent one from becoming a priest - although there seems to be that thought lingering in the background.
There has been absolutely no showing of how many boys start serving and actually quit because of girls; only apocrypha, which appears to overstate the case.
And no one has spoken to reasons that boys might not serve (even with girls!), such as school, recreational and Classic soccer; school and non-school football; school and non-school baseball, to name three sports which tend to predominate; music lessons; less than weekly attendance at Mass; parental inability or unwillingness to add one more activity to already overcrowded schedules; and I suspect we can come up with more issues.
Priests who make secular choices?? So if a girl serves, and as part of her involvement directly in the Mass by serving at the altar, she discerns a possible vocation to the professed religious life, that is a secular matter?
It is too bad that CARA has not done a study of religious orders and candidates, postulants and novices as well as professed religious, to see how many of them served Mass. I’d lay dollars to donuts they would not have to search with a microscope and a search light to find them.