Forrester said:
And with this change . . . maybe that party storming the Temple would actually have a realistic chance.
Yeah, they have a realistic chance of standing against a spellcaster who uses Commune, Scry and Teleport, etc. But what about all the other spells in his spellbook?
What if he drops a Forcecage on them, and follows up with an array of Fireballs, Cloudkills, and Cones of Cold?
What if instead of Scrying, he just has spies throughout the area reporting on activity?
The problem isn't the spells themselves...it's do you really want to roleplay a powerful, evil spellcaster as a true genius who doesn't act like a villain from James Bond? Your answer is change the rules....but all that does is make the villain think of other insidious ways to find out the party's location.