You're conflating multiple different things.Well we saw it onscreen with the Clones gunning down the Jedi and they didn't se se it could.i g.
1) Jedi being able to sense emotions.
2) Jedi having precognition of what is about to happen in combat, which is why they're able to dodge and block so much stuff that's obviously far beyond what you could consciously do. This seems only be like seeing 0.5-1s ahead, note. Maybe a little further for a few. We could call this "combat precognition" for simplicity.
3) Jedi having Force-visions of things that will or might happen at some point further in the future - these visions are often quite long or detailed.
The Clone Troopers weren't angry or hateful to the Jedi (initially - that seemed to change later), so the being able to sense emotions didn't warn the Jedi that Order 66 was coming. And by the time their combat precognition kicked in, it was often too late, because they didn't even have their lightsabers drawn or the like. Some, especially those who weren't attacked from behind, did manage to fight a bit but mostly they got overwhelmed by numbers, as we both agree is possible.
3 was countered by the entire Force being clouded by the Dark Side - this is mentioned repeatedly in stuff set around that era.
There are. But there's also a lot of dumb ideas that don't make sense outside of weird EU thinking. Shotguns and grenades are two of those - the acid grenade would be smart if it pre-detonated (or detonated as soon as its direction of travel began to change or it slowed significantly), but as it appeared in the Darth Vader comic it's just absolutely dumb and reliant 100% on Vader reacting in a dumb way - again a way that would even worse if it was an explosive.So yeah if you have to hunt/kill Jedi there's various ways to increase your odds it seems.