The text is also larger and the speech bubble closer to and more aligned with her mouth, in front of her body in the direction she’s moving, and in a more visually interesting part of the frame. Additionally, the second bubble starts with an ellipsis (continuing the first’s), indicating even subconsciously that you shouldn’t start there.
The height, of course, is the main factor.
This would be a major sacrifice to form factor and would be strictly detrimental to 99.999% of users. Regarding benefits outside repairability, basically nobody in 2026 is going to think to carry around a second, fully-charged laptop battery. Regarding repairability, you might have to replace the battery once during the laptop’s lifespan, and the procedure is extremely straightforward.
With an external battery, you end up with a laptop that’s not only substantially thicker, but which – because it’s stuck with a large battery either on the back or on the bottom – likely has worse airflow.
Notably for this repair, there are seven captive Phillips-head screws (seen plenty of hexalobular etc.), you can just use your fingers to remove the base cover (seen plenty where you need/want a pry tool), removing the base cover already removes the battery’s screw(s), and most importantly, you just pinch to disconnect instead of lifting a fragile connector off the board. Swapping the replacement external battery once you have it is probably about 30 seconds; this is about five minutes – practically no difference accounting for how infrequently it’ll need to be done. There’s an exception for people with a physical disability like Parkinson’s, but if you can phone a friend, the process is straightforward enough for basically anyone else to do it on your behalf.
Edit: On a whim, I decided to look to Framework for a comparison. It’s worse there for battery replacement.
As far as I can tell, the T14 is the easiest battery replacement you’re going to find being sold today. If you’re able-bodied enough to use a screwdriver and it not being external is somehow still a serious concern for repairability, I don’t know what to tell you.