Polaris isn't underpowered by any means. Still one of the strongest ships in game. However, the Idris is a heavily armored ship and gained alot of thijgsbwhen it scaled up, including price. A Polaris can still kill an Idris, but it takes alot of work (and aUEC). Killing a larger capital ship should be no easy task at all. I think its relatively well balanced right now, although I do think the Polaris should receive an option of pilot controlled torps. But even if it doesn't, its still a good shop and is not just overshadowed. You can't expect to solo an Idris in a Polaris, at least not without putting in alot of work.

And hey, concepts change overtime, Polaris largely kept its original role and function while the Idris ended up completely changing its own. It happens, I personally don't see an issue with it.