I just checked the cost of some of them with my Titan. Those optimizations are way too expensive. There is no sense in it. Might as well not even get them.
The optimization is not a requirement, it's an option. It gives the ship an edge in battle / navigation / manufacturing / freighter.
I can assure you I have tested each and every optimization with all ship hull types, and the costs are balanced to the gains vs. module slots etc.
As more missions will appear along with carrier ships, optimizations will be very very useful. I can see a Leviathan class with a Mothership optimization, transporting Interceptor / Assault Bomber frigate class vessels, doing combat missions with those fighter wings. The mothership could tank the first pirate ship, while the fighters make quick work of the objective ship.