https://www.pcgamer.com/are-hdds-dead-a-look-at-the-present-and-future-of-storage/

SSDs continue to improve in terms of durability and affordability, but they're still not quite at the capacity (or the GB/$ ratio) to push HDDs entirely into obsolescence. Are they? Traditional platter hard disks continue to be an extremely cost effective way to stash massive stockpiles of data, and while they'll never equal the speed of SSDs, especially for random access times, for cheap storage en masse they remain the king of the data backup hill. 

That said, with the way the best SSDs for gaming continue to expand in terms of capacity, and as prices continue to tumble, there's a convincing argument to be made that a traditional HDD is no longer required for most modern, consumer-level PC builds. In fact, a number of prebuilt gaming PC manufacturers are eschewing platter drives entirely and only including single SSDs, both as a way to mitigate dreaded loading times in PC games and productivity, and to push down the overall cost of their builds (as compared to including both SSD and HDD alternatives). Even SATA SSDs are continuing to yield market share to NVMe alternatives, with a report from DigiTimes suggesting that NVMe SSD sales will equal SATA SSDs sales in 2019.