Wow! Never thought of that... In fact, I know about the 4 “thing” in Asian culture but never thought it would still be valid/viable in tech area...
Just was going to post about this! Although, I did find it interesting that Nikon (another Japanese based company) decided to use 4 when they continued the model line with the D4. There must have been enough US presence within the company that they were convinced to just keep it going in sequence.