Presets (Even your own) are fixed and offer minimal flexibility.
Drawbars you alter to suit the mood, e.g. you will not always use the same settings even playing the same song.
It also involves the feel of the shape of the drawbars, which cannot be emulated by presets or touch screens.
In answer to your question
If you have never had them, then you will not miss them.
If you are used to them, then there is no other substitute
Hope this helps

Bill