Hey, UncleE.
I think it is a bit concerning. Is there any reason why you couldn't pick Dr. Rozbruch or Paley? Insurance should cover your surgery, since you're not doing it for cosmetic reasons.
With that said, fixation (external and internal) are tools of any modern orthopedic surgeon. I trust that the quality of care in the US should be good enough even if you're not going with the most experienced ones in the area of distraction osteogenesis. It is indeed concerning, however, how they're apparently dismissing PT, pain management, etc; most specially how they also want to discharge you out of the hospital so soon. Not even Stryde patients get discharged the day after the surgery, from what I've seen. I wonder if they understand you're not simply placing a trauma nail, but lengthening your shorter leg.
I'd also recommend sending any questions and concerns you might have to Dr. Paley at dpaley at paleyinstitute dot org. This could possibly help assuage any fears you might have, or get better orientation on how to handle your case within the framework of the US healthcare system(s). I'm not American, a doctor, or a veteran of this surgery, so, as always, try to be the most informed possible, and don't take online medical advice to heart.