ForceUser said:
If PCs can walk around readied, so can bad guys. And you don't want that, because there are always more bad guys than PCs.
There also is the issue of how the game flows if this is allowed. If the players want to try and avoid surprise or losing initiative then they are going to constantly be interjecting stuff when you're just trying to be descriptive:
DM - "You round the corner and see a hallway extending into the darkness. On the left is a door..."
Fighter Player - "I Ready to Charge anything that comes out the door!"
Rogue Player - "I Ready to Flank anybody the Fighter Charges!"
Wizard Player - "I Ready to Magic Missile any creature that comes out that door!"
Cleric Player - "I Ready to Turn Undead if an Undead comes through the door!"
DM - "...and in the hallway there is a dark figure..."
Fighter Player - "I Ready to Charge the figure if it looks hostile!"
Rogue Player - "I Ready to Flank anybody the Fighter Charges!"
Wizard Player - "I Ready to Magic Missile the figure if it attacks!"
Cleric Player - "I Ready to Turn Undead the figure is Undead!"
DM - "...that turns out to be a statue next to another door on the right..."
Fighter Player - "I Ready to Charge anything that comes out the door!"
Rogue Player - "I Ready to Flank anybody the Fighter Charges!"
Wizard Player - "I Ready to Magic Missile any creature that comes out that door!"
Cleric Player - "I Ready to Turn Undead if an Undead comes through the door!"
DM - *sigh* "About that House Rule on Readying outside combat..."