Two more cons of powered speakers I have experienced:

1. each one needs to have a power supply to it. This may seem a small point, but if you use a power mixer or amp you usually have it close to the keyboard so as to be able to control the sound during the gig, so it's easy to run a power supply. If the speakers are not close behind you, you may well have a problem with getting the power to the speaker.

2. It's hard to make any adjustments to the speaker setup during the gig. You are relying on the EQ in the keyboard alone.

Just things to think about, imho.

Graham