I don't think it's superficial, but two problems adding up. Previous poster is talking about general latency issues because everything is networked and potentially quite far away.

What you point out is slowness once you hit the entry point. Go, or similar languages, as a server language platform could have solved that problem from a computational perspective. But it did not for the most part. In my opinion people choose the faster stuff because it's cool and they have more wiggle room to cram in to get back to the slow status quo.

Everything is overengineered, software or distributed architectures, sound to naive human logic but alien to computers. It's an cultural problem, development is so deeply entrenched into "business logic" that the minimal viable and computational economic solution isn't even on the table. I don't even think it has to do with cost or feasibility, it's just that your random e-com manager wouldn't know what to do with you, if a programmer really starts talking about hardcode tech stuff.