No one is using light shields (solution)

[Luceon]

Add the rule from Pathfinder 1E. It is found on page 152 of the core rule book.

Shield, Light, Wooden or Steel: You strap a shield to your forearm and grip it with your hand. A light shield’s weight lets you carry other items in that hand, although you cannot use weapons with it.

I have yet to see anybody even consider a light shield, let's at least make some incentive (besides weight) for carrying a light shield.

[Zman0]

I think the solution is no ACP for the light shield. Though being able to hold something in that hand is useful. Not having an ACP might get some dex builds to consider it more.

[Ediwir]

Back when I wrote my P1 houserules, Light Shields gave the same AC bonus as heavy shields but did not allow blocking (yes, of course I had a shield block houserule). I understand it's not something that would fly in P2, but I agree that some form of incentive must exist.

[Dasrak]

The niche light shields had in PF1 was due to the fact that it was a free action to switch which hand you were holding your weapon in. This allowed a cleric to switch a weapon into the hand with a light shield, cast their spell, then switch it back. In PF2 this isn't possible since switching hands would be a full action, and many classes actually have feat taxes to get around the problems this is causing. Reverting back to PF1 balance in this respect would solve the problem, and also make stuff like Emblazon Symbol less of a mandatory tax that every character needs (since it's just letting you upgrade from a light to heavy shield)

[Zwordsman]

Would be kind of amusing if Heavy Shields could shield block- and were more durable for that.
and light shields worked like previous bucklers and you could use your hand for various things (not holding a weapon.. but holding torches, drawing items, somatic events, grabbing onto a ledge or rope).
Like make light shields the type that is strapped more readily to the arm with a thinner leather grip, which would leave most of the grip space open and wouldn't interfere with holding a sunrod.

I think that sort of thing would be best. More so since Buckler's are gone.

TLDR
heavy shields stronger for blocking
light shields can't block, but you can hold non weapons in it and interact with it.