A logo makes you recognisable. It doesn't tell anyone applying your brand what colours to use, what tone to write in, or how to lay out a social post — that's what a guidelines document is for.
You're a solo operator or very small team, you don't have anyone else creating content or materials for the business, and your main presence is one website plus maybe one social platform.
Multiple people create content for your brand, you're inconsistent across platforms, or you're about to invest in physical collateral — packaging, signage, print — where a mismatch actually costs money to fix.
A fast AI-generated mark is genuinely fine if you just need something now and have no one else applying your brand. It stops being enough the moment more than one person needs to represent your business consistently without you personally reviewing every piece.
Yes — that's exactly how the Brand Identity and Full Brand System packages are structured, as an upgrade path rather than a rebuild.
Yes, the full logo suite — primary, secondary, and icon — is part of Brand Identity, not a separate purchase.
A real test: does it look consistent everywhere it appears, and would a stranger describe your business the way you'd want them to based on it alone? If yes to both, it's probably fine.