While faster is always better when it comes to storage, all things are relative. Even a slower M.2 NVMe SSD, such as the entry-level Kingston A1000 NVMe reviewed here, offers a noticeable boost in performance over SATA SSDs. Quite noticeable.
The problem for Kingston and other entry-level SSD vendors is that Samsung and WD are playing hardball with the pricing of what are essentially top-tier drives. The 970 EVO, WD Black NVMe, and Sandisk Extreme Pro all offer twice the performance of the A1000 for about the same price. For smaller vendors using third-party NAND, that’s really bad news.