2018 MacBook Air Teardown Confirms Improving Repairability With Adhesive Pull-Tabs Under Battery and Speakers
https://www.macrumors.com/2018/11/08/2018-macbook-air-ifixit...
Amusingly, the 13" MacBook Pro non-touchbar where they have defective SSDs are the only ones that have removable SSDs. The touchbar versions are soldered. I wonder if that's a happy coincidence that they're repairable, or if the reason for these defects is that Apple's engineers screwed up the socket since they have basically no experience with those across the rest of the product line anymore.