People seem to misinterpret the purpose of anti-vibration feet. Anti-vibration feet aren’t to reduce vibrations within the printer; they won’t affect your print quality positively. Nor are they to dampen sound. They are to enable the printer itself to vibrate/wobble rather than the surface the printer rests on.
Without anti-vibration feet, the vibration forces the printer makes are distributed to the surface the printer rests on; for example, if you have your printer on a desk, the vibrations will be transferred to the desk and cause the desk to shake. Anti-vibration feet somewhat isolate the printer from the surface below, allowing the vibrations to be absorbed by the feet itself, limiting the amount of vibration forces put on the surface the printer rests on. Think of the anti-vibration feet as another table the printer rests on, and THAT table absorbs the vibrations instead of the main table.
These are most useful for if your printer is on a desk or in a print farm; particularly, when you have multiple printers on one surface. This is because each printer’s Vibration Compensation only compensates for its own vibrations, not the unpredictable vibrations of any other printers that rest on the same surface. So, by using anti vibration feet and “isolating” the vibrations of a certain machine (thereby reducing vibrations transferred to the main surface the printer rests on), any other printers on that same surface will be significantly less affected by external vibrations.
However, while anti vibration feet work well for CoreXY printers like the P1 and X1 printers, they don’t work well for bedslingers like the A1, especially top-heavy bedslingers. This is because of how each of these types of printers distribute mass and handle movement.
In a CoreXY machine, the center of gravity doesn’t alternate very much and most of the vibrations are caused by the fast movement of the light toolhead. On a bedslinger, due to the rapid movements of the bed, the center of gravity alternates frequently and vibrations are caused by both the movement of the toolhead and the heavy bed, which can be amplified when there are models on the bed. This can create a large amount of imbalance, especially when considering having anti-vibration feet on the bedslinger, which are designed to allow the printer itself to wobble and shake rather than the surface below it. When additionally considering the presence of top-mounted AMS units, it can become quickly apparent how anti-vibration feet on the A1 could cause more issues than it would solve, as it would amplify vibrations in the printer.