I think like many subjective things, your brain accepts and normalises. You simply forget.
In hifi terms it's burn in..
Personally over time it seems fine.
For Sergetti stringing I marked every string by the grommets and none of them have moved.
This is after a couple of weeks playing 3-4 times a week.
Lashing out on forehands, backhands and serves for all I'm worth.
For the tension to even out, the tight string must give to the skacker one..
This would in my mind result in the marks moving.
Of course the whole string bed will be losing tension but the relative string individual tension holds.
I've only used Head Rip Control mains and Prince Premier Touch crosses. Perhaps very slick poly could slip more, but tensioned up the strings bind with the grommet wrap around pretty tightly..