When we should avoid useEffect?

If you’re not trying to synchronise with some external system, you don’t need an effect.
If your effect wasn’t caused by an interaction (like a click), React will let the browser paint the updated screen first before running your Effect.
If your Effect is doing something visual (for example, positioning a tooltip), and the delay is noticeable (for example, it flickers), replace useEffect with useLayoutEffect. Even if your Effect was caused by an interaction (like a click), the browser may repaint the screen before processing the state updates inside your Effect. Usually, that’s what you want. However, if you must block the browser from repainting the screen, you need to replace useEffect with useLayoutEffect.

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When we should avoid useEffect?

If you’re not trying to synchronise with some external system, you don’t need an effect.
If your effect wasn’t caused by an interaction (like a click), React will let the browser paint the updated screen first before running your Effect.
If your Effect is doing something visual (for example, positioning a tooltip), and the delay is noticeable (for example, it flickers), replace useEffect with useLayoutEffect. Even if your Effect was caused by an interaction (like a click), the browser may repaint the screen before processing the state updates inside your Effect. Usually, that’s what you want. However, if you must block the browser from repainting the screen, you need to replace useEffect with useLayoutEffect.