Sometimes you open a program, it gets stuck and you dont know if its still loading or if the program has frozen. No hdd led = retarded imo.
OK, but a lot of software doesn't have high HDD load anyway and with SSDs the HDD loading time is very short so the HDD LED becomes less relevant in knowing whether a program is working or not. What if the program has a massive memory leak and starts paging to the hard disk? Then your HDD LED is going to be going crazy even when the software has failed. This is a really bad way of telling if a program is running or not.
You could instead check in software what tasks are running on your computer or run from the command line and view what happens in the terminal. An HDD LED as a workaround for poor software is a pretty poor workaround.
Oh, and please I know the term 'retard' is used a lot on the Internet but it is a little unkind on people with mental problems. The work stupid would have been fine and not discriminated against anyone.
Not everyone uses SSD yet. Lots of times during load times of demanding games I thought "this crashed" but then when I was about to ctrl+alt+del it I looked at the HDD led and it was blinking. So I just waited a bit more and it loaded.
Also, personally I work with audio, so I need massive storage drivers (just got a 7200 rpm Seagate of 2TB), sometimes you dont know if your DAW is loading a sample or if it got stuck. HDD led makes you more patient. If it wasnt for HDD led I would have gotten pissed up a lot of times at long loading times thinking the program just crashed when it didn't.