Not in-character. Voldemort has his own scaling too. Voldy > Severus > Harry > average wizard not trained in Occlumency
Still doesn't reach Sidious' level since Luke himself resists city-wide mind hax just a few months more or less after A New Hope. And mind hax absolutely is in character for Sidious. Iirc correctly he told some giant monster thing to go kill itself, he also was on the verge of mind haxxing ROTJ Luke, who's vastly superior to his ANH self.
While certainly useful, is not nearly as powerful as Legend's version of it. Voldemort is pretty adept at stacking multiple spell effects one after the other, including AoE stuff (see his battle against Dumbledore)
Except Palpatine's precognition also allows him to sense even the
intentions behind Voldemort's actions. Couple this with Sidious' telepathy and he can essentially know what Voldemort is going to do and counter effectively.
Thought based teleportation counters.
Aside from the fact Palpatine's precognition can predict where Voldemort will teleport, he also doesn't need to choke and grab Voldemort with the Force necessarily, he can just as easily use force pushes and waves to knock back and disarm Voldemort.
Doesn't particularly matter when this would mostly be a hax battle. At least, from Voldy's side. He has way greater variety in that sense, including his legilimency magic allowing him to keep tabs on Palpatine's actions.
Again, Sidious is above the likes of Vader and Endor Luke who themselves are massively superior to post-ANH Luke who could resist city-wide mind hax. Voldemort is not mind tampering with Palpatine's mind, while Palpatine can tamper with his.
Palpatine's best skill feats are in a cqc battle sense, while Voldy has contended against very similar abilities to those of the Emperor and even more esoteric abilities.
Voldemort has not contended against someone with the precognitive, telepathic and telekinetic prowess of someone like Sidious, and most of Voldemort's abilities can be countered one way or another.
Palpatine can stop Voldy's flying, which will promptly force teleportation, and now Voldy knows he can't **** around. The real question is not if Palps can bypass type 8 (which is a non factor), the real question is if Palps can deal with the amount of bs Voldy can conjure up in pretty quick succession.
Palpatine will predict where Voldemort teleports and can use telekinesis to just...rip him apart? Snap his neck? Even if he didn't want to use lethal methods (for whatever reason) he can at the very least disarm and disorient Voldemort, although obviously he can go for much more fatal applications of this power.
Voldy can transmute the Lightning into virtually anything he thinks of (he could transmute energy-based attacks from Dumbledore into snakes, for example), while simultaneously using his legilimency powers to try and enter Palps mind. This part is way more debatable if he could, as they do have similar scaling chains of mindhax bs, but I can say Palps would most likely resist this. But that would put Voldy even more on edge.
But Voldy can use a myriad of distracting effects, AoE, undodgeable curses and/or charms (hell, the paralysis charm is pretty much an instant win to secure a killing curse).
Yeah good luck transmuting Palpatine's Force Lightning which can take even Vader by surprise, and overpower his defenses as well. Not to mention it was too quick for Yoda too.
Nothing Voldemort has counters the most likely wincon in this battle. Sidious' telekinesis, which he can use to quite literally kill Voldemort before he does anything too dangerous for Palpatine. AP is also a factor here since it's what causes another advantage in Palpatine's favour as his abilities such as telekinesis and Force Lightning can have much more force behind them than what Voldemort can deal with. Hell, Palpatine one-shots Voldemort with his force abilities.
Edit: Btw, nothing stops Voldy straight up possessing Palps. Something that's way more in-character for him than mindhax is for Palps.
What you mean Voldemort possessing someone as a spirit? He did that only against animals and a Professor who was actively seeking him out, so it's not anymore in character for Voldemort than mind hax is for Palpatine, as I've explained above. Sidious can incap with mind hax just fine, or better yet counter Voldemort's possession (if it's used) by directly absorbing his life-force.
Palps likes to toy with his opponents.
And Voldemort is quite arrogant himself.
Another factor is that it is entirely possible for Sidious to just sneak up on Voldemort. He has done so to even Darth Vader before.
