Family size is not an indicator of emotional or financial stability.
Small families can be poor, too. There are large families that are well off. Mothers of small families can have worse parenting skills than those of large families.
Considering the matzav today, the career choices for frum people have had to expand. “Writer” seems to be one of the most popular careers for Jewish women currently, so why not try it (unless you are looking to write something antithetical to a frum lifestyle)? we are raising our children not to be clones of their father in respect to his career. let them follow what they are good at.
and in eretz yisrael, they import irish firemen? there there are no jewish policemen, forest rangers, etc? here in ny there are also jewish policement etc.