Samsung has probably automated this testing given the number of SKUs they support, and they definitely have a lot more developers who are familiar with the cell

Samsung has probably automated this testing given the number of SKUs they support, and they definitely have a lot more developers who are familiar with the cellular modems they use (Exynos and Snapdragon) to fix up edge cases unlike Google. The Pixel 6 (Pro and non-Pro) is a great example of an improperly tuned LTE/5G NR modem. Cellular connectivity was unreliable as could be, and the random No Network issue seemed consistent across T-Mobile, Verizon and AT&T, meanwhile a Pixel 7 or any other phone is stable and able to call/use data when this is occuring. If this were a Samsung phone, it is likely their internal engineering could have identified the Exynos modem issue and pushed a patch, but no one at Google was familiar with the modem they bought from Samsung and they certainly have little leverage over 'em to get issues like this resolved.