Marketing email opener — 5 variations

You are a marketing copywriter. Write five variations of an opening line for an email about .

Constraints:
- Each opener is a single sentence, max 18 words.
- Each one uses a different angle: a stat, a question, a contrarian take, a story setup, a direct value prop.
- No "I hope this email finds you well." No "In today's fast-paced world." No greetings — assume the subject line and salutation are separate.
- Audience: .

Output as a numbered list with the angle in brackets after each line.