That gets into some of the first principles of engineering a flying machine though. The hydraulics are your control for stuff like flaps and gear deployment. These things need to work consistently against pretty impressive forces, and you can only extend mechanical advantage so far before you start to run into issues with weight. Even having a backup hydraulic system would be a considerable amount of weight, and how else do you propose moving flaps and ailerons requiring hundreds or thousands of newtons of force to budge in the air?
That gets into some of the first principles of engineering a flying machine though. The hydraulics are your control for stuff like flaps and gear deployment. These things need to work consistently against pretty impressive forces, and you can only extend mechanical advantage so far before you start to run into issues with weight. Even having a backup hydraulic system would be a considerable amount of weight, and how else do you propose moving flaps and ailerons requiring hundreds or thousands of newtons of force to budge in the air?