howandwhy99
Adventurer
I don't think this is much of a problem. If they were comfortable dumping the stat initially, they were planning on playing in such a way that Strength is of minimal use. How much are they going to shift to using it when equipped with the belt of giant strength? Is the Strength 8 wizard going to suddenly become a tank because his strength shot up to 25? Unlikely... but if he did, at least he's no longer casting all those powerful spells, right? It's not like the switch to melee brute doesn't come with a trade-off.
To be fair, Guantlets of Ogre Strength granted 18/00 strength, so whatever the previous rates the wearer had +2 to hit & (i think) +4 damage on all melee attacks. That's something, though armor proficiency isn't part of the package.
Besides treasure and equipment loss / usage, I don't think we're talking about how stat modifiers can now have a much larger influence than class, at least at lower levels, on a lot of what defines class. AC, attacks, damage, hit points, and so on.