I recently found and bought two vintage Damon Howatt stabilizers, to use on a Howatt Monterey bow.
I was intrigued by stabilizers, as they often came with new bows in the 60's & 70's, yet their use today has declined. In a way, like recurve sights.
Sometimes people having bows refinished will have stab holes filled, along with sight holes
I found the stabilizers helped to slightly,cut down any hand shock. In addition, the slight weight added to the bow, helped shooting accuracy.
The benefits, I found, were only slight.
I sold the Monterey, so I no longer use the stabilizers.