This is the same thing with Tarn Mison and Red Squadrons. Both cost 23 points, Tarn is PS 3 and has a nuts ability, Red Squadrons lose that nuts ability in exchange for PS 4.
Not normally worth it. I agree with you OP. But it's not really that big of a deal, all it means is that if you're taking one Defender you go with the Countess. If you're flying multiples, you pick the Countess and Glaives. Just like If I'm flying one X-Wing I'll pick Tarn, and if I want multiples I tack Red Squadrons onto Tarn.
Other ships have pilots like this too. They only vary by a point or two but one is autoinclude while the other is pretty much only there if you've already picked the autoinclude one. Juno, Carnor, Avenger Squadron Pilot vs. A Saber Squadron Pilot, etc.
Part of the thing for Tarn is that his nuts ability only becomes REALLY nuts when he has a 2-point astromech equipped. Red Squadron pilots have a broader Astromech selection to choose from.



