Well as for how long FFP scopes have been around, that would be for a very long time. The Bausch&Lomb Balvar line of scopes for example which were popular in the 60s were FFP. That also included their 6x24 power target model scope which was very popular with long range hunters for decades, after a change of the type of external adjustment setup from the standard one. The reticle was a tapered crosshairs setup because of the FFP. I used one for about 25 years before changing to a Nightforce, and I’m still not convinced it was a good or at least a necessary move for me. As for holdovers, rest assured that if you hunt long range you will be at some point be using them. The longer you hunt you will come to realize that although dialing is wonderfull, and the best, it isn’t always in all situations. Never take your eyes off the animal, especially in wooded terrain. And you can use the animal or the rock your shooting at as a gauge as to where to hold for follow up shots as easily and maybe even faster than using a reticle. Any of the different type scopes will work just fine, use what you have if you have it. The difference will ultimately come down to you, not the scope. If i had an old Leupold laying around, I’d be apt to be sending it off to them for a target knob Installation at least for starters till you got your mind wrapped around things more.