I hope you're not talking about the actual picture because that only shows rs-232 to which ancient people commonly used to connect their mouse, or sometimes their highspeed 2400 baud modems.
Discussion
Actually, I did. d-sub and rs-232 are still living in various realm of engineering because of their simplicity (work with 1/10 of hardware and code, even compared with USB 1.0). This type of interface sometimes still useful when you need reliability rather than speeds, such as measurement equipment and general control.
Yes rs-232 is still common and useful, but i doubt you can find mice that connect to it. I think it was actually invented as a standard debugging port.
I agree with you. Come to think of it, I used DE-9(rs-232c) to connect an external modem to my PC to connect to the internet in 90's.