Does bull's Str stack with Belt of Str?

and if you just make better spells... then why should the people even Wear any of that neat gear.. when the spells are alot more powerful...
ex new spell: Ledendary strenght: +15 strenght last for 8 hours etc..
thats the time of an adventure... wizard buffs everyone in the morning.. and they are all good and ready to go.. ??

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