Why would anyone want the toilet to be dependent on the electricity? If no electricity no flushing. ...?

Question

What is the problem with the regular system that someone needed to come up with this idea?

Answer 1

Yes, likely a power flush to compensate for the lower water usage, or to use even less water. Very useful for places where you may have to truck in your water.

And in some cases for places like in a basement that had no toilet and the drain is higher than the unit they add a pumping system to pump up to the drain because you know what always flows downhill. ;-)

Answer 2

Most electric toilets run on battery. The idea is for sanitation, if someone does his/her thing they flush before they wash.

Answer 3

I'll assume you're in the U.S.

Many years ago, toilets flushed a lot of water down the pipe and everyone was happy.  Then someone got the bright idea that using less water would be lovely, so they got a law passed that made it illegal to sell toilets that flushed more than 1.6 gallons with the idea that this would be a Good Thing.  

So now you have to flush it several times to get everything to go down and in the process use way more than you used to before.  Toilets from Canada are pretty hot here in the US since they don't have the same limit.  I believe  that in certain border states a cop can give you a ticket if you're carrying a contraband toilet from across the border - beware.

Enter the electricity solution - pressurize the water being flushed.  A lot more ooomph should theoretically push everything down the pipe.  Even on those days after you decided that eating those 3 hours old chicken wings from your dashboard is a good idea.