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Necessary, no....Improved cut quality, sometimes. With a full-kerf blade (rip, combination, etc) you may not see much difference. Using a thin-kerf blade, especially with thicker stock, is when it will be most noticed. I have them and use them, others say it's not worth bothering.
Many years ago I had bought a Craftsman radial arm saw along with stabilizers. I still have the stabilizers but I believe that the power tools and blades of today are far superior. If I put a new blade on and it vibrated, I would return it.
They are not designed (nor claimed) to stop vibration of a free-spinning blade. If you have one that vibrates while it is not cutting, you have a different issue. It could be a bent arbor, bent blade, poorly balanced blade, etc. The stabilizers are supposed to help stiffen the plate of the blade and keep it from flexing during the cut.
I was under the impression that Forrest recommended them except in cases where they would limit cutting depth.
A blade stabilizer may help the cut on a cheap saw or with a poor blade. If you have the Ridgid 2400/ 3650 or equivalent, all it will do is limit your cut depth. IMHO, spend the money on a better blade and a ZCI. If the blade is getting out of true, the ZCI will show it readily.