The copy you have taken from my website, www.liquidsqueezebrush.com simply states places where this toothbrush is more convenient to use than the normal toothbrush, toothpaste, and bottle of water. Since it has liquid dentifrice in it, there is no need for water. I mean, you don't rinse with water after you use mouthwash do you? Matter of fact, you're not even supposed to drink after you use mouthwash for 30 minutes. At least that is what mine says. This toothbrush is a shift for sure but it combines brushing and rinsing together.
The statement you said about "replaced the everyday toothbrush" is a possibility and it won't happen over night, just like 8-track tapes, vinyl records, and VHS didn't go away over night. But it will happen with this toothbrush. Open up you mind a little.