I don't want one keyboard for everything.

A 61-note light action arranger that weighs 25 lbs (PSR-S910) suits my arranger needs.

An 88 note weighted action piano, like the 25 lb Yamaha P-85, suits my piano playing needs.

A 76-note semi-weighted keyboard is total crap for playing piano on, and is needlessly too long for my arranger needs.

I might be happy with a very light (30 lb) 88/76 note arranger as long as the keys are weighted hammer action.

88/76 weighted keys on an arranger (if the weight is under 30 lbs) is far less of a compromise to me, than a 76-note semi-weighted keybed.

I never have an arranger gig that requires me to play solo piano, and neither do I have a piano gig that requires arranger background.

On the very rare chance of needing both, the P-85 and the S910 aren't a big deal to take with me...both are light and compact, and set-up/tear down time, for me, is never an issue.

Ian