Re: sharp frets edges on new guitar
You're talking about 2 different things. Sharp fret ends, and unfinished fret ends [or barely finished, or badly finished, etc.] Sharp fret ends are from shrinkage of the neck. Unfinished or badly finished are where the edges of the frets haven't been properly rounded for comfort while playing. This is very common on MIK and almost all 3rd world production, and used to be very common for MIJ also. MIJ are much better than a decade ago but you'll still run into unfinished or poorely finished guitars, and I enhance all of them anyway.
Nicely finished fret ends can also be turned sharp by a a tech taking care of shrinkage, if he doesn't properly finish the fret ends when he's done.