My theory would be they were pretty far into 2nd edition at that point (the demons/t'a'n'a'r'r'i and some of the giants have 2nd ed stats in Pools and the monsters in FRUA have a mix of 1st and 2nd ed XP awards) and forgot they didn't have a Remove Paralysis spell.
I always max'ed as a kid, sometimes leaving mental stats alone. It's a game, why not win? Pool gives you an option not to do that by scaling the encounters, and it does give the characters a little more character, but, you know, powergamer.

Now I tend to use the pregens figuring that reflects the designer's vision for the game. If not available I'll max STR/CON/DEX and INT/WIS where necessary and leave the rest as rolled. I'm short on time, what can I say?