It looks like they’ve gotten better recently, but exactly how much isn’t really clear.

Backblaze lifetime annual failure rates for:

HDDs: 1.45%

SSDs: 0.90%

The HDD AFR is +0.55%, but if you look at the drive count and drive day numbers, you can see why the SSD AFR varies pretty wildly, and why the confidence interval is way higher.
If you think this is enough to say SSDs reliability is definitively solved, that’s fine, but

HHDs have mechanical parts that make them far less reliable.

is a bit much.

SSDs are still very unreliable compared to HDDs, any bulk or critical data storage is done on HDDs.

It might seem unthinkable to gamers, but speed isn’t the only thing that matters when it comes to storage.