Apparently it is if they're unwilling to stand behind their repair. The excuse of ESD is a red herring. It either works when it leaves the shop or it doesn't.
Nope. Not a red herring at all. Please list a few manufacturers who will support user-repairs on a sealed device.
Will Samsung do a reapir, out of warranty, on a phone that's been opened? Nope.
You might want to read up on ESD damage.