Doug Miller writes:

It doesn't seem that you've ever made ice cream at home.

Go ahead an scoff while you speculate about what's best. I get paid as an
engineer to analyze, design, and implement flash chilling systems. I know
how these things work, in theory and in practice, on a home scale and on a
1000s of liters/hour industrial scale.

At home I flash-chill cans in under a minute, by the process I described,
and with the concrete, quantifiable results I have claimed. It's not
speculative on my part. I have analyzed and verifed the direct-contact-
with-ice principle both ways, that it works, and that the other ways don't
work.

Now if you want to erect a conceit that you know better, go do some
experiments with your brine notions and report back. Otherwise your
hunches and expressions of contempt for wisdom and experience are just idle
insults, and a parody of engineering. Which is what Usenet is mostly
about.