GML Why is there a need for redefinition of basic variables?

[Lyric8925]

for example, why we need to replace "hspeed","vspeed" to custom var like "hsp" and "vsp" ?
i can't imagine the disadvantage of using hspeed directly...

 

[Nidoking]

Do you like being able to control how x and y change from one step to the next? If you use the movement built-ins, you're ceding that control to the program.

 

[Coded Games]

The built in hspeed and vspeed will always move your objects. That is fine if that is what you want to happen. But for example if you want to implement delta timing you cannot use those variables. A lot of built in variables are fine for beginner use but when you start making more complex projects their “features” become problems. So most tutorials will have to use custom variables instead to avoid unexpected behavior.

 

[Lyric8925]

Do you like being able to control how x and y change from one step to the next? If you use the movement built-ins, you're ceding that control to the program.

The built-in variables are not just (hv)speed, but also x and y...

 

[Lyric8925]

The built in hspeed and vspeed will always move your objects. That is fine if that is what you want to happen. But for example if you want to implement delta timing you cannot use those variables. A lot of built in variables are fine for beginner use but when you start making more complex projects their “features” become problems. So most tutorials will have to use custom variables instead to avoid unexpected behavior.

Well, although I'm still confused now, maybe I'll understand it later when meet these problems

 

[TsukaYuriko]

Setting hspeed and vspeed sets gears in motion that update an instance's x and y automatically every step, with you having no control over this behavior.

Using x and y doesn't set any such gears in motion, therefore you are not giving up any control.

 

[Lyric8925]

Setting hspeed and vspeed sets gears in motion that update an instance's x and y automatically every step, with you having no control over this behavior.

Using x and y doesn't set any such gears in motion, therefore you are not giving up any control.

Oh, thank you. I understand now.
In fact, I seem to have run into this problem already, when dealing with collisions