system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why would a Jedi bother fighting something like a battle droid with a lightsaber when they could just disarm them from afar with the Force? Human opponents even more so?

What was stopping Obi Wan from simply restraining Jango Fett or General Grievous, as we see Kylo Ren do with Rey?
gpt
Kylo Ren used an advanced technique called Force Stasis, which he specializes in. 

Skilled opponents such as Jango Fett and General Grievous are usually too fast and aggressive to use such tecniques upon. Grievous in particular was able to fight Jedi at speeds of up to 20 strikes per second, breaking Obi-Wan's defense. Once someone like Grievous got in close, a Jedi had to focus on defending themselves in combat instead of mustering up the focus for a Force technique. But when Jedi are given time tl focus, they often do so. When Ventress pulled out lightsabers against Yoda he easily just Force Pulled them out of her hands, and when Grievous did the same to Windu, he got his lungs crushed.