I think this argument isn't valid. The problem that React solves is creating reactive user interfaces. React is trivial to use in it's happy path. The tool's complexity is a red herring because using the tool is trivial and effortless.
To me, this argument is based on specious reasoning. Take for example vending machines. They are trivial to use: pick a product, pay, see it drop and pick up your item. It's dead simple. Does it make any sense to whine that buying items from an automated system is a problem not everyone has, and that the vending machine is far more complex than a seller behind a counter? No. What makes sense is the complexity from the user's perspective, and what effort it requires them to achieve the goals they set forth to achieve. And React makes it trivially easy to put together highly performant reactive web apps.