system
Given the following post, respond as if you're commenting on Reddit:
human
(Star Wars) Why was general Grievous such a threat to Jedi?

Granted, he could match or excel their strength, speed, agility and lightsaber skill. But he has no force powers. Couldn't a Jedi just force push him off the nearest cliff, or use the force to pull his armour off, or to immobilise him, or influence his mind, etc etc?
gpt
Most Jedi were not lightsabre combat masters.  Remember the Sith have been gone a long time so for most Jedi they are used to fighting guys with blasters. so that is what they spent most of their sabre training learning.  When confronted with a light sabre wielding foe they fall back to the rudimentary training they had at the Temple.  That training was ostensibly built around fighting Sith and Dark Jedi.  With those foes using force pushes isn't the best idea since they can be countered with the force and take concentration away from your sabre combat.  So when Jedi that has never fought sabre to sabre outside of the temple has a four armed cyborg leap at them swinging light sabres they default to their training and focus on textbook fighting.  This is even more of an advantage to Grievous since Dooku trained him so he knows the rookie moves most Jedi would be using and how to counter them.  Since Obi Wan actually fought against a Sith Lord and knows the danger that poses he dedicated a lot of his Sabre training to how to fight Sabre to Sabre and used a defensive style that was a good counter to what Grievous did.