I downvoted you because you're French.

I was talking about the window in the picture in the comment I replied to.

In Europe we use roller shutters for that

At that point why do you even need windows?

If you get windows one step above "cheapest available" you get a moveable screen.

Windows are the kind of thing that are generally built locally for multiple reasons. So your experience will vary greatly based on what the window factory in your area is doing.

Where I live, single hung windows (only one sash) are most common, so only one screen is needed. Double hung windows are less common because people don't want to pay for the expense of the additional sash (a lot of springs and mechanisms needed for a sash). A screen is an expense too, but nowhere near the expense of an additional shaft. Possibly the intent was to allow for opening the top to making cleaning easier, but that's usually accomplished by having the top "fixed" portion of the single hung window be able to tilt out because putting all the springs and mechanisms for an additional sash for a feature to make it easier to clean isn't necessary.

Yeah... I worked at a window factory before. The calculations needed to figure out the tension needed on the springs so that it will counter the weight of the sash was fun.

It entirely depends on who installed the windows and what brand. Our windows are amazing and high quality.

Because its not possible to pull the window into the seal when the window also needs to move up and down.