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To be fair it took me couple of days to learn the basics of react. But I had years of programming experience, including other frontend frameworks like angular, angularjs, knockoutjs etc.
To be fair, I know enough first aid and background information to understand some basic medical books, and I can 1000% guarantee that you never want me to treat you for any medical problems.
Eh, lots of stuff can be easy to learn, difficult to master.
Most languages only take a few minutes to do a "hello world" app.
When you announce you're comfortable with something, it probably depends on the scale of the apps you're used to working on.
So a junior dev could very well feel they've learned something like react after two days of cramming.
A textbook example of the original meaning of Dunning-Kruger, wherein an inexperienced person is unaware of what they have yet to learn and thus overestimate their existing skills.
Yet totally fail to make a production inside 2 months.
This is a good point imo. They just don't know the breadth of it yet. Being experienced also means getting a grasp of the amount of stuff you don't yet know.
Me too, but I wouldn't claim to know React unless I felt good at bluffing.