Reason 2: It would be a step back. Remakes are usually outsourced to smaller, less experienced studios.
Yeah, like Beamdog. *Barf barf barf barf barf barf barf barf barf barf barf*
The enhanced editions weren't remakes, they were the original games enhanced.
Remakes of the first two would most likely be ruined with whatever modern dumbed down features and 5e ruleset.