In MMA the risk of eating a big knee is higher for when you shoot for a takedown.
Unless you did freestyle wresting or Sambo, shooting for the legs in BJJ isn't a powerful thing. BJJ is more gentle than Sambo or Wrestling. In MMA the risk of eating a big knee is higher for when you shoot for a takedown. I prefer Judo so I can stay upright and control the clinch and not risk getting KO'd.