Can someone who's worked in an org this large help me understand how this happens? They surely do testing against major browsers and saw the performance issues before releasing. Is there really someone who gave the green light?
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Don't listen to the opinions of the developers writing this code. Listen to the opinions of the people making these tech stack decisions.
Everything else is a distant second, which is why you get shitty performance, developers who cannot measure things. It also explains why when you ask the developers about any of this you get bizarre cognitive complexity for answers. The developers, in most cases, know what they need to do to be hired and cannot work outside those lanes and yet simultaneously have an awareness of various limitations of what they release. They know the result is slow, likely has accessibility problems, and scales poorly, and so on but their primary concern is retaining employment.