i am not ONLY a OMB, but play with my praise and worship team in the church as pianist or guitar player (that is actually more often than pianist).

when playing along with some more people, i often would like to have weighted keys on my keyboard. for piano lines, definitely i'd like to have it. but then, when i play by myself, i think i prefer sytnh action better.
at times, i use the keyboard for drums sounds. i play the drums manually on the keys, and then for sure i'd hate having to use weighted keys.
and yes, basically, i can play the same or even better using the arranger instead of old roland xp60 workstation.

i also use my keyboard as a midi input for my computer, when working in the studio projects. i am happy with it the way it is, because i know some more controlers (faders and assignable buttons) are hard to ask for in a arranger.