You kinda made my point with the whole "try and find another operator to send 2400bps to" part.
The digital communication is not conventional, it's revolutionary.
Analog communication is conventional. And radios and their components aren't exotic.
Yes, modern communication is fantastic. But analog will still be more reliable
HDD, SSD and NVMe all have different versions. Later generations are normally 2x faster than previous version. Comparable generations are normally an 8x speedup. (Later generations are in parentheses).
HDD to SSD is like 80(160)->300(600).
SSD to NVMe is 300(600)->2400(4800, 14000).
So, it's likely a similar upgrade, unless you did HDD-g1 to SSD-g2 to NVMe-g1 (using G1/G2 to simplify).
It's also likely possible that your computer is running so fast that a doubling or quadrupling in speed is a diminishing return as you don't notice the difference.