By any type of map, from Jakarta to Surakarta, or Jakarta to Bali, you'll have to fly entirely above the Java island, not Java sea.
If you want a direct route to Surakarta, sure.
However if you take off heading east you will likely go out over the sea for a portion of the journey.
Even if you did take a direct you, you would be quite close to the sea and easily see it out the window.
Going to Bali you would cross over a portion of the sea even for a direct route.
So again, that video shows no problem.
The definition of 'West' and 'East' in globe map is wrong so that the navigation will become wrong as well.
Says you.
You have provided absolutely nothing to indicate that is the case.
Perhaps 'get lost' means 'inefficient'. If you can go straight why you go curved?
Well the first thing to ask is if you can go straight?
As the runways are not aligned correctly, YOU CANT!
But even if you can, there is still the question of if you should.
Pilots will often change course to use winds or avoid bad weather or specific terrain.
Some will be restricted to specific air corridors and will need to turn to follow them.
Some times multiple planes will be in the same area and they will need to turn to keep a safe distance.
The straight route is not always the best.
And just like so often, none of this is actually an argument against the globe, because all maps will have this problem.