That was an interesting idea but it took too long to develop and by the time the bugs were worked out the Gemini program had ended. Also, a capsule with a parasail lacks the cross-range capability of a true lifting body design, which means control of the spacecraft after re-entry is a bit limited. I'd rather have a true lifting body vehicle, which means after re-entry the flight crew can land plus or minus 500 miles from the intended touchdown point; for example, a lifting body intended to land at Edwards AFB could land as far south as Miramar Marine Corps Air Base and as far north as Beale AFB.
> a capsule with a parasail lacks the cross-range capability of a true lifting body design
Actually, the Apollo capsule *did* have an impressive cross-range. Remember, it did not drop straight in, blunt end directly forward; it was asymmetrically balanced, so it "leaned" over to one side. That turned it into a half-ass decent lifting body with several hundred miles cross range. Hypersonic L/D was surprisingly good.