I have yet to have any "pros" criticize my equipment. I HAVE had weekend warriors and people who consider themselves pros criticize it. They are usually in my audience wishing they could get my job.
I've had lots of stars and big-name pros hear me. Without fail, they have been complimentary and often inquisitive. They don't look down on arrangers, because they have no clue what they are in the first place.
It's for certain they don't give a rat's a** whether they have speakers. They have important things to worry about.
Personally I sort of like having speakers, but it's not important enough to affect a buying decision. I usually turn them off during a job, but I have played small jobs with just the keyboard speakers. VERY small jobs!
I had one last year that I played every Sunday for several months. I first took the Bose. They said it sounded great but there was no place for diners who didn't want to hear music to get away from it. Then I tried Logitech Z2200. They said it was too loud, even though I could barely hear it.
One Sunday I just took in the S900 and played through the onboard speakers. They loved it. Volume was perfect. Go figure.
Sure enough, I left it playing and walked around the room. You could hear very well, about the volume of an acoustic piano.
BTW, setup time was about 120 seconds.
You use whatever gets the job done.
In any case these non-pro instruments have kept me from having to get a real job for a LONG time.
HankB and I had a good friend who was a full-time entertainer also. He would play a set, then do yo-yo tricks for 30 minutes.
It wasn't a pro yo-yo, but the guy using it was. I think that may be the difference.
DonM