When a client requests a POC or you need to develop one for your pitch, these frameworks come in very handy. Many times you learn that the client uses XYZ framework, so you need to quickly adopt the same and get going. I agree that knowing fundamentals is a must but learning these frameworks is quite important. One may not completely understand the innermost workings but as long as you can use it reasonably well, half the battle is won and huge amount of time is saved.
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When a client requests a POC or you need to develop one for your pitch, these frameworks come in very handy. Many times you learn that the client uses XYZ framework, so you need to quickly adopt the same and get going. I agree that knowing fundamentals is a must but learning these frameworks is quite important. One may not completely understand the innermost workings but as long as you can use it reasonably well, half the battle is won and huge amount of time is saved.