I can not see any problems here ?
Except for using your harness for 7 years and "complaining"
No problem to wear things out totally - but then you can not expect things to hold up of course.
I typically use a half to 1 harness per year, occasionally 2, and sometimes it will last for 2-3 years instead of half a season
But I ride a lot, so to be expected - and using different brands regarding harnesses.
ALWAYS wear an extra harness in the car of course, as that is the one and only thing you CAN NOT ride without...
You can always rig a bigger or smaller kite if your kite breaks down - and you can always wear a colder or warmer suit if your current one goes bad or zipper defect - but having only one harness can ruin and end your day totally
Regarding harnesses - besides looking at the stitching - take a look at all belts where they go around in sharp bends - as this is the point that will most often wear out fast.
Even worse if covered under some padding, so you can not see it is about to break