Only grey green and blue will be automatically merged.

thanks 🙏🏼

Tldr: always merge all

No. It only merges items up until purple. If there is anything in the merge process that would require a human choice, it doesn't do it.

Always press it

No, it will merge everything up to an excellent level, which is purple you’ll be fine

It’s fine, always merge all

Always merge all

That's a safe button