Well, I don't know about over time. I haven't run one long enough because I switch cartridges all the time. What I'm talking about is immediately observable. You set your VTF to 1.5 for example, and the AS to match (not running the brush let's say) and you drop the needle. You will notice immediately that the cantilever goes off to the side a fair bit--like a quarter of the stylus gap. If you back off the AS, it centers again. You can do this all day. I can't remember which direction it goes off to, but I'm going to say towards the spindle since the AS is trying to counter the inward pull of the tip by increasing outward force. So, when you increase AS, the cartridge moves outward and the cantilever stays in place.
The effect is immediate. Even one gram shifts the cartridge outward. The only way to keep the stylus in center position relative to the cartridge is with a 0 setting. Originals don't do this, and to my knowledge, I don't have any other styli like this.
I do have some old Empire 888 cartridges with the opposite problem. They must have been run on a table like the 398 for a while as all the styli are warped outward, but if I set AS to 3 while running the cartridge at 1.5, the tip centers and plays fine. Lots of life left on the original styli. Someone kept buying new carts instead of new styli, because I got a stash of three of these from the same seller all with the same problem. Estate Sale find.