I’ve seen polarized weapons used mainly in the following three areas:
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Stealth Bombers-since bombers are glass cannons that die quickly when tackled or fired upon anyways, you might as well fit the polarized launchers since having resists likely won’t save you even if you get caught.
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Polarized Oracles for AFK structure bashing - Max dps for AFK bashing of structures (mainly POCO’s)
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There are some polarized abyssal runner fits I’ve seen. I don’t have the link but one of the main twitch streamers was running a polarized deimos fit to run level 5 sites. Here’s a forum link to someone doing the same: Garry’s Great Abyssal Guide: solved ships & fits to run L5 abyssal sites!.
There are a lot more niche uses for them out there, but those are the more mainstream scenarios I see them being used often enought.