They "claim" this is normal due to the stripping and power lift mechanism. With that said, I know plenty of 2021s, including a guy I work with, where the alignment is near perfect even though the weather strip doesn't go all the way up. The issue obviously is, whatever order they are putting the glass on, and I assume it is going windshield, then sun roof or rear roof, if you have the front or next piece of glass off on the sunroof, you have no choice to get the lines of the glass/gaps between them, so what ends up happening is it ends up being a simple 2mm shifted to the right side of the trunk and moved off the left side giving that gap. Alignment issues all start with the first piece of glass, quarter panels/trunk etc...how they are installed/aligned. It could easily be resolved at the factory by having tighter standards/methods of installing all of the glass/panels and ensuring it is all set correctly..but they don't care, they are just throwing these things together as fast as possible and just giving the old same, hey, it's supposed to be like that and within "tolerances"...blah blah.
So to finish this rant, I take my car in to have them review/resolve several issues, they ended up fixing half of them. 3 of those were obvious, dented speaker grill, sunken door handle, and the front fender/quarter panel gap that meet next to the hood/headlight...well of course, they fix something then make the alignment of the hood like 1mm from hitting the panels now upon closing and screwed it up almost as bad from a visual inspection.
Unreal...how they were just to supposed to get the bumper piece lower that was poking up, all alignment was good, to match the quarter panel piece, and end up having it shifted closer to the hood is beyond me the piece that wasn't the problem....sigh...just a joke their QC and standards. Never see this with any other premium brand....
Now instead of the gaps looking perfect all around, I have this on the right front. As mentioned, the hood gap all around was perfect like the left front is, not anymore...thanks Tesla service!!!
And as I've posted prior, here is my trunk and my coworker's. See the slight difference? Part is the trunk being off on the left side and not matching exactly with the top roof line, the other part is the glass being misalinged..just a few millimeters and this is the result between a good alignment and a bad one. Then, if you move the trunk and adjust that over...guess what, now you have a gap between the rear quarter and trunk that is too big...so there are multiple issues.
Ok enough, you get the point...it is just bad factory QC/tolerances and techniques at Tesla.