It depends on your purpose for learning Arabic. Consider the following:
For conversation – If you want to speak with native speakers comfortably, fluency will help, but basic conversational skills may be enough for daily interactions.
For Quranic studies – If your goal is to understand the Quran, fluency in Modern Standard Arabic (MSA) isn’t required, but a strong grasp of Classical Arabic and Tajweed is important.
For travel or work – If you're traveling or working in an Arabic-speaking country, learning essential phrases might be enough, but fluency can be beneficial for professional settings.
For academic or business purposes – If you need to read, write, or conduct research in Arabic, fluency will be highly valuable.