Homey, you're about 10 years out of date. Toto's gravity toilets (of which I have 3), do an amazing job of QUIETLY flushing away everything. Turns out that if the trapway through which the waste goes is well designed, you don't need a rocket motor to shoot the stuff through it.
You are correct that the old 1.6s stunk. I had one by Kohler. My Totos are night and day, including one that operates on 1.28.
So while your answer was totally right years ago, now there's no need for the rocket motor.
And Consumer Reports's toilet results aren't too well-regarded on here, although I will say that at least they were smart enough to recommend the Toto Drake this year.
PS For all your gung-ho spirit about living without the pressure reducer, i wonder what your wife would think if she saw the photos and videos above, or if she had to pick shards of china out of your grandkid's skin. Or even if the thing went off moments after a child had used the bathroom, like the pissed Dad in the video above. Just sayin.