Okay this has now been addressed multiples times but I'll repeat myself again just for you.
Lightsabers and Darksabers apparently require a certain mental state (whether it be belief/faith/confidence--take your pick) when using them regardless of whether the user is proficient in the Force or not.
Moff Gideon, a non-Force using weakling, was able to swing the Darksaber around with ease during his duel with Din Djarin. On the flipside Din Djarin a physically fit lifelong warrior could only use the Darksaber for a few short strokes before its heaviness made it almost unusable. The Armor called out his mental focus and chastised him for "fighting the blade instead of his opponent."
In Rebels Kanan gave Sabine (also a non-Force user) similar instructions when he had a lightsaber and she had a Darksaber so apparently the two weapons operate with a similar philosophy.
We know from Yoda that personal faith/confidence is critical to properly use the Force ("I don't believe it/That is why you fail") so it makes sense that faith and confidence would be required to properly use the weapon of a Jedi as well.
I'm sure Han Solo assumed that the lightsaber could easily cut through the Tauntaun so it did.
Somebody posted a gif of Finn stabbing a Stormtrooper clean through his armor the first time he held one. Well we know from TPM that a lightsaber is more potent when used to stab than when slashing. Qui Gon easily penetrated the double blast shield door at the beginning of the movie but if it was equally potent as a slashing weapon then he could have just carved a big circle in the door and stepped through. But he didn't. The stab was easy, getting to move the saber around when embedded in such thick metal wasn't.
That's obviously false. Many films prior to 1983 (Samurai/horror/etc.) showed people getting dismembered with swords. Hell Parker knocked Ash's head off with a freaking fire extinguisher in ALIEN almost half a decade prior. The technology was obviously available to show guards getting cut up (or at the very least tight shots of Luke swinging the saber and then cut to dismembered guards) but the most sensible explanation was that George simply didn't want up the MPAA rating.
No they didn't. Luke knocked multiple guards into the Sarlacc Pit with his saber and you heard them screaming all the way down.
Yep and Kenobi has clearly been shown to be rusty, off his game, and second guessing himself. So the lethality of his blade has been very consistent with teachings from Yoda, Kanan, and the Armorer.