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Agreed that it's a result of not having people experienced with building systems at scale.

That's not a technical choice since the person writing code wasn't aware of the options, so it's a business choice. How good of a business choice is it, though?

We all know at some level that a well-intentioned but inexperienced engineer can make a decision in an afternoon that will take weeks or years to clean up. I often see junior engineers spend several days over-engineering something that a senior engineer would have done simpler and better in a fraction of the time. I don't think it's a given that junior engineers provide better return on investment early on that a senior engineer.

Getting some worthwhile feedback and advice from a seasoned engineer doesn't need to cost a fortune in up-front cash, and personally I think it'll pay for itself. You either compensate them with stock or hire them as a temporary or part time consultant.