"Skill Empowerment and pass without a trace are both concentration spells, which means your sorcerer can only be rogue-level good at hiding or seeking at a time, while the rogue is rogue-level good at those things always (and 1/SR can just choose to max roll on any skill)"
I strongly disagree.
I'll explain to you how to do Seeking and Hiding.
Hiding: Sorcerer's Casts Subtle/Exteded Skill Empowerment (Expertise on any skill) casted on himself or MMD simulacrum + Simulacrum's Subtle/Extended pass without trace.
37~47+2d4 Stealth check. You roll once against creatures passive perception, you remain hidden until revealed. The Rogue can't beat him.
Seeking: With Subtle/Extended Skill Empowerment on the MMD simulacrum or himself
Her perception check is d20 with advantage + 17 +1d4. Each turn, means 37+1d4 Perception check. She can do it flying on her Pegasus.
Each turn with Search action.
Another way is cast it on Ethrealness plane and the MMD Simulacrum will find literally anything.
It's amazing to detect Wizard's traps. Skill Empowerment (Investigation)+ Trance of Order automatically knows every Wizard's traps.
The Sorcerer use action to reappear, casts Quicken Wish Duplicating Dark Star
The Simulacrum action to reappear and casts Quicken Wall of Force.
Bye bye. It's a deadly sentense against everything. Including rogue.
So is your DMM/simulacrum in the sky doing active perception checks, or close to you with Pw/oAT. BC it's hard to hide in the sky on a flying horse, and if they (pegasus and/or rider) get within range, they will get picked off (and I don't really see how you get to make perception checks from beyond max weapon range or how they'd communicate what they found to your sorcerer).
Also, the rogues can search for you with their action and hide with their bonus action, every turn, and they should be since you're a known murderer. So there's no 'I beat your passive, lol' stuff to pull here.
And Trance (again) only lasts one minute, so you'd have to know when you should use it. which is the conundrum, right.. None of your creatures has the passive perception to find any vanilla rogue with their lowest roll to hide (27 without guidance). So you'd never know to be looking to start burning those trance minutes, spell slots, and sorcery points.
And, even if you did, the rogue could just take 20 on their hide check (for a total of 37 without guidance). Sure, under exactly the right circumstances, that is a beatable check, but it's for sure not an easy one.
And all this is still without subclasses, races, or feats. Could be a deep gnome with the deep gnome feat for at will Nondetection for no spell slot. Could be an arcane trickster for spell thief, where you have to make a save or lose your alpha strike.
And..all this is assuming you're getting to fight a single target. There are 6 of these rogues out there, and you're burning through spell slots and sorcery points like crazy, while they're spending...nothing.