What I said was about WHO made SD to have such speeds and capacity for WHY. There are real people who decided to make SSD drives have more capacity and increase speeds from something much slower than current SDXC cards to something much faster than the fastest 15K-RPM SCSI drives.
Camera manufacturers wanted to satisfy the needs of photographers. Cameras only need to write at the speed of storing RAR and JPG image files. That's 10MB/s or 50MB/s sequential reads and writes. Samsung from the start designed their controllers so that Samsung's own employees could boot from Samsung-designed SSD drives instead of HDD drives. It took more than 10 years for Samsung to introduce 1TB PCIe drives at last. SD cards can be written at 100MB/s or more. While most bestselling SSD drives can write faster than that, 100MB/s is practically all the speeds most PC users would ever need in most usage cases. 100MB/s or 300MB/s, that's just 3x difference. SSD is meaningful because of the ability to write thousands of small files, not because of 200MB/s or 500MB/s or 2GB/s sequential write speeds though 2GB/s would obviously please most heavy users. Most reviewers and experts in the early years of SSD development focused mostly on sequential write speeds of big files. They compared SSD's 30MB/s write speeds against HDD's 80MB/s write speeds and concluded SSD's slow and expensive but offers faster access times.
SD and CF and other camera-oriented standards and form factors were thousands of times more popular than SSD 10 years ago, and 15 years ago. They were widely popular here on CDFreaks in 2005 while everyone laughed at SSD. It's easy in 2013 to say SSD should be faster than SD. It wasn't 10 years ago.