New hobbyists do kill a lot of things because of inexperience, but the point is that with the traditional light systems, its pretty hard for even a new hobbyist to muck it up. Giving a new hobbyist instructions regarding percentage output of different colored LEDs, ramping profiles, and color temp profiles is just asking for screw ups.
I can't count how many threads Ive seen that go something like: "I don't know if I have my LED set correctly, I have the blues at X% and The whites at Y%". What does that even mean?! I started my current tank with LEDs, and i kept fumbling around with low percentages. I had kept the percentages low before that because everyone warned about cooking corals. Later I found out that the particular LED system I had tested very poorly for par. After that, I ended up cranking them up to 100 and the corals grew a bit. They never colored up and they had horrible pale patches and die off wherever there were shadows. If I was forced to run those exact LEDS again, I would buy 2-3 times as many and then I probably would probably have better luck. Savings would be nonexistent compared to the T5s I run now, but I could get coral to grow better than before.