Yes and no. Using your car analogy, the developer would be a mechanic working in the engine bay. They might be able to get by working only on parts not directly related to the transmission, might even be great at it, but would you not prefer a mechanic that understands all of the engine mechanics?
Similarly, abstract memory management might be obfuscated away in high-level languages, but it still happens. Understanding the mechanics of it will improve the efficiency of your code. Most high-level languages don't require you to manage the memory yourself, but that doesn't meant you don't need to keep memory usage in mind.
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Yes and no. Using your car analogy, the developer would be a mechanic working in the engine bay. They might be able to get by working only on parts not directly related to the transmission, might even be great at it, but would you not prefer a mechanic that understands all of the engine mechanics?
Similarly, abstract memory management might be obfuscated away in high-level languages, but it still happens. Understanding the mechanics of it will improve the efficiency of your code. Most high-level languages don't require you to manage the memory yourself, but that doesn't meant you don't need to keep memory usage in mind.