They mean one pole does everything- facelift- it's light, rigid,and the best out there at the moment, but it's expensive.
Ref the SL-X I understand the deliberate limiting of choice and optimising the design by actual usage by window cleaners.
Maybe at some point a shorter closed lenght and even less reach could be an option for someone wanting an absolute gold star A plus down pole.
For example a whole foot shorter would give a closed length of just over four feet and an extended lenght of twenty( down from twenty four), but what a pole it would be!