I am talking about car and pickup tires. Back in the day, say 45 years ago, I used recaps all the time and had good results with them. There was one place in town that did custom recapping. You could bring you vehicle in in the morning and it would be ready to go in the afternoon with with 4 (or 5) of your own newly recapped tires.
Back then there was a big price differential between new and recapped tires. Over the years recaps became more expensive and new tires became less expensive and lasted much longer. The original tread on a tire will last longer than the recap tread.
Now, most tire stores around here do not sell recaps. Honestly, I have not looked for recaps in many years.