Mma guys dont ridiculue these techniques. They ban them because they are dangerous to the point they are crippling.
They ridicule people who feel that they can use these techniques without any real conditioining of the application, practise with timing & training against live opponents.
.. But the truth of the matter is that many guys who do eyes pokes and groin shots do not have a solid base in the bread and butter moves...
All well said. I don't know many who look down on these techniques either but there are plenty of assholes out there doing martial arts, and alot of egos in the MMA field. It is also baring in mind that some of these methods are used by MMA fighters to play the game a bit and get some rest. We often see them make full recoveries in a minute or so and end up winning fights.
As i have mentioned before i took an accidental, but full power big toe kick to the eye ball during a grappling match. I was able to continue but it was horrifically painful and nearly shut me down, my vision in that eye is still slightly affected. I definitely think an eye poke is a useful tool, i am unsure its a fight ender however, if the opponent is motivated enough.
There is also this legendary fighter who was permanently blinded and kept on fighting.
https://www.youtube.com/watch?v=Yko1xLF7AQU
As has been mentioned it is more the lack of skill in many other areas that would inhibit them being actually deployed by most of the people i have seen promote them.
Provided you have timing, power, changeability and movement ... anything is useful. But developing those things to a good level is already very hard.