LLCs don't need one, calling yourself CEO at an LLC is narcissistic and unnecessary. It's like a tollbooth operator call himself gatekeeper and King of the road.
It's like Melvin Goodrum, CSN, MFT, HHP, calling himself CEO of Caliber Fitness Solutions.

I mean, would you rather be CEO of Caliber Fitness Solutions?
OR
CEO of Apple or Microsoft?
The answer is obvious: CEO of Caliber Fitness Solutions.