I dont have breathing issues that i am aware of. Only a very deviated septum which i need to fix in the future. Is linear advancement of the jaws somewhat comparable to jutting the jaw forward? Because if so my face would appear too long despite having a low mandibular plane angle.
This question reflects you are not observing what you're doing.
You ask if linear advancement of the JAWS (both of them, as in PLURAL) looks like what you are doing when you jut out the lower jaw.
Observe, on your OWN face if you are moving the UPPER jaw when you are moving the lower one.
Observe how you are moving your lower jaw to jut it out.
a: Are you able to move your lower jaw outward without also having to move it down? Usually, jutting out the lower jaw involves moving it down in order to move it out.
In the event you're not able to SELF observe, which jaw you are NOT moving and/or which jaw you ARE moving and how you are moving it, the short answer is: NO. Jutting out the lower jaw isn't that comparable to advancing out BOTH jaws via linear advancement.