That begs the question: why is Google using subpar developers? It's hard to imagine there just not being any better ones, and it probably isn't a money issue. Are they so against having good old employees?
Core product/infra work, and anything non-trivial, is always done by FTE's.
The common saying in engineering is you use the right tools for the job. Likewise, you place the right people to the right job. It would be a mismatch to put an L5+ to do some low impact work. That would be an inefficient use of limited resources. The SWE would also be unhappy since that affects their perf/promo. Depends on the potential impact/difficulty/urgency, it might be more appropriate to save that work for an intern, fixterm, or TVC.
It's not about "so against having good old employees". It's business.
I wouldn't waste a google dev's on grunt work that any coder could do.
If you can figure how to make that process "super simple" you can make staff engineer. Source: am L5 SWE at Google spending most of time wrangling unclean data
They're wrangle protobufs.