Also note the particular construction of Lando's words. What Vader is attempting isn't carbon freezing, per se. It's nearer to medical stasis.
Which is exactly the point I'm making. Later SW fiction seems to assume that carbon freezing is the default, proven method used for medical stasis, but what I'm saying is basically the same thing you're saying -- that the scene in
Empire indicates that carbon freezing is something else that Vader is adapting for medical stasis and that isn't ideal for that purpose.
Remember, Vader isn't reaching for this plan. This isn't some desperate, last second gamble, nor is it portrayed as such.
I never said anything of the sort. I merely pointed out what the movie itself makes very explicit: That the characters were uncertain that a human could survive carbon-freezing, and so Vader used Han as a guinea pig to make sure. Uncertainty doesn't mean desperation. It just means that the procedure is not trusted to be safe, that Vader is taking a gamble by using a potentially dangerous process.
Vader has a plan, which the characters in the film itself seem to think is quite sound. They certainly take it seriously and treat it as likely to entrap Luke.
Which characters, exactly, think it's quite sound?
LANDO
Lord Vader, we only use this
facility for carbon freezing. If
you put him in there, it might
kill him.
VADER
I do not want the Emperor's prize
damaged. We will test it... on
Captain Solo.
Lando's face registers dismay.
BOBA FETT
What if he doesn't survive? He's
worth a lot to me.
VADER
The Empire will compensate you
if he dies. Put him in!
http://whills.nu/5/emp-2.html
That's two characters who object to the risk Vader is taking by using carbon freezing on a human. And as I've already quoted, though Threepio has faith in the durability of carbonite, he's iffy on whether Han can survive being frozen in it. I looked through every line of that sequence in the script (which is adjusted to be accurate to the final film), and the only character who expresses confidence in Vader's scheme is Vader himself. And even Vader is uncertain enough that he feels the need to test it first.
Look, let's come at it another way. Whether or not this is a well-established use of carbon freezing, it's clearly understood to be a risk to those who are subjected to it. A lot of known and established practices are known to be dangerous, like major surgery or building skyscrapers. Even if they happen frequently, they have a significant risk of being fatal. Clearly carbon freezing falls into that category of known dangers, or there would've been no need to "test it... on Captain Solo."
So my problem with the
Clone Wars episode is that a whole bunch of people are carbon frozen, and 100% of them survive, and it's all very easy for them to come out of it (no short-term blindness or any other side effects). There was lip service paid to it being a dangerous and crazy plan on Anakin's part, but in execution, it seemed quite casual and easy, and that ease undermines the impact of the sequence in TESB. I think it would've been better if the risks of it had been played up more in the episode -- if maybe one or two of the clone troopers hadn't survived, and if maybe one or two members of the strike team had suffered aftereffects of the freezing.