Mortgage software actually sounds interesting and complex.
Game developer working for someone else sounds boring.
Game developer working for someone else sounds boring.
Personally mortgage software sounds complex but boring to me.
Game developer sounded interesting and complex before I knew more about it. Now it's more boring as in after knowing the death march culture I don't want to know more. I guess your parent meant that too by 'boring'. If you work for yourself or with like minded indie developers that sounds more interesting to me.
It can definitely be complex.
Working for a big studio is like creating a movie with directors and for some that feels like fun but working on mortgage software is about data normalization which can offer it's own high.