it's always possible to fix such problems with some effort.
Well lwith effort you can do lot of things !
But tools are made to avoid too much effort , and gain lot fo time to go more fast on producing a game !

For Normals, i would like to see the arrow of normal and only on faces i selected : caus actually that's difficukt to see anything !
Perhaps a future 2.6 evolution to visualise only normals of selected faces and with an arrow ?

Well ... Anything perfect , even on Unity Engine the import of FBX model have some normals problem , but not the same ??