Because the lockdown is 10th Planet specific.
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People who think the lockdown "doesn't work" or "isn't viable" have never had a good lockdown player dominate their top halfguard game with it before.
Then they are not using it to its potential.
Eddie provided the solution to this problem recently. When the guy in top half posts on his free foot to start standing, you underhook that foot at the ANKLE and immediately start working for electric chair. It is actually easier to get the leg on the shoulder from this position than electric underhooks.
Ever since I learned the lockdown, it's helped me immensely against bigger and better opponents. I've pnly been training for 3 months, but this single technique has saved my ass more than I can count.