That isn't the point. HW decode is more energy efficient then SW decode. With current insane energy prices, every little bit helps.And if your CPU can't handle AV1 decode, it ain't the card for you anyways.
That plus the fact even the most basic Celeron (G6900) from Intel has full HW support. Its just a bit disappointing, that's all. AV1 does stand to become very common.