As far as the op's question, no reason at all you can use the newer servos.
AFAIK all digital servos still accept analog inputs.
And what's the big deal about binding. Stay with one manufacturer. I use FlySky and its sub brand Turnigy. They provide bind plugs but you don't need them on the i6S, i10S or 9X. The i6S is a pain with model memory because it doesn't "remember" the receiver by model, but rebinding is simple. The i10S manual says you can bind different receivers by model number.
I used to have a Spectrum DX6 and was glad I only had one airplane bound to it. Expensive PITA transmitter.