True and I agreeThat's only for one fence setting. Sometimes it needs to be further back, sometimes further front. It's enough to change bit and use one with slightly different bearing diameter (if using these kind of bits which is quite common for coping sled operstions) to having to move the fence. Can be done using shims or other method but it complicates things a lot having to align the fence parallell to the miter slot.
I was just looking at the mechanics of a fence adjuster from the back side.
There has to be one like the below one that adjusts both sides in sync.
This might not work for my Bosch router table as it has slots not channel slots