I have two pairs of vanillas that have the same issue. I carried on using them without any noticeable decline in performance.
I now put fork oil on the stantions before use. Cycle the forks a few times to get the oil around the seals and ride
After use I make sure I am thorough about getting all the crap out from that hidden bit behind the brace section which is where the wear occurs.
Hose with water and then use a cloth/rag which i wrap around the stantion and pull each end of the cloth back and forwards to clean it then lube again.
Been doing this for circa 3 years since I discovered the wear.
As you say, it's oil and spring so less issues about the tolerances.