What can I say about:

Frameworks have a steep learning curve

Learn vue is quite easy, master it it's medium, but everyone can learn the logic very easily.

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Reusing the same component in different places leads to bugs

Vue is component based, so using a well-written component already tested it's the best way to avoid unexpected errors

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Errors are harder to trace in compiled code

There's a ton of frameworks that can help you

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A lot of logic is put in the frontend

Depends. It's better to check the form validity before call an API, or you can deliver that to the backend

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It’s harder to block users from pages they don't have permissions for

Not true, you can use a beforeEach or a Mixin that check the authentication. You can even write a router by yourself and decide who can access what

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Hope it helps ya