I personally did not install thermostat, I had a new copper brass high efficency raidiator installed, they changed water pump, backer plate, thermostat and housing now I have the issue of running hot on an incline. So to answer your question i would hope not based on this shop all they do is cooling systems and have been around 40yrs...but dont know.
As for the hoses, yesterday when my temp gage was in the middle (couldn't check when it got hot, or not safe due to traffic) i can put my fingers on the raidiator cal and leave them there (i dont have a big heat tolerance in my hands) i could also squeeze the top hose on the raidiator and touch my thumb and middle finger with the hose between them, so not that hot definately mor 200+ degrees. The top hose has something in it, dont know that it was full though.
The raidiator whol har it for 3 weeks, jeep dealer had it the next 3.5 weeks and did nothing, now i took it to a guy i know at a ford dealer. It's been 7+ weeks with no vechicle, until 2 days ago I got it back, just to find it doing the same thing.