Tyros is build as a home Keyboard... Yamaha never intended that people use it to gig. And i don't think they will change that any time soon.
You hit the nail right on the head.....!
the emphasis on "HOME KEYBOARD"
In my opinion, the Tyros4 is
primarily meant(and designed) for home use, but, many professional (advanced) players are using it for gigging..it is only 30 lbs or so.
If we want to really define the "home keyboard" thing, any instrument with "easy play" features, like
single finger chording,
automatic accompaniment, and
automatic harmony in Right Hand, is a
home keyboard...and yes, that includes the Tyros4, but also, the PA3X (and Pro), the G-70...even the Audya. The Korgs have a more sophisticated editing system, but they are still arrangers made
primarily for the home player.
Yamaha and Roland keep things a bit simpler, although you can extensively edit the former with the software
included with the instrument.
Having built in speakers really makes arrangers even more "homier", like the S910, the PA-800, the E-80 etc.
If they were designed
exclusively for pros, you would not see a "single finger", or "one finger chord" option, or built in speakers.
It's good the entry level PA-500, is working for you on gigs, but, truth be told,
you are playing a home keyboard. That's not so bad, is it?
Ian
PS...Good luck with your eyes...I hope you are back in shape as quickly as possible.