Plenty of companies are willing to spend the thousands of dollars building everything from scratch rather than rely on bought components they can't control or know entirely. Developers & management from that world may not know (or trust) available libraries; doesn't mean they're not "senior", it means their skillset may not match your needs.
The reverse complaint can be made: ask a candidate to build a small dashboard to show some e-commerce data - from scratch. If he can't do it without third-party libraries, is he "senior"? If he can do it, surely he's capable of spending a couple hours finding available packages to shorten the development cycle (saving time & money at the cost of reliance on outsiders).
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Plenty of companies are willing to spend the thousands of dollars building everything from scratch rather than rely on bought components they can't control or know entirely. Developers & management from that world may not know (or trust) available libraries; doesn't mean they're not "senior", it means their skillset may not match your needs.
The reverse complaint can be made: ask a candidate to build a small dashboard to show some e-commerce data - from scratch. If he can't do it without third-party libraries, is he "senior"? If he can do it, surely he's capable of spending a couple hours finding available packages to shorten the development cycle (saving time & money at the cost of reliance on outsiders).