I would rather have deadlines than give estimates.

A deadline is a clear moment in time when the feature is needed. There's a reason behind it. "We need to be ready for event X", "Next billing period is in a week".

Fixed deadlines allow you to negotiate the content of the feature, and make meaningful choices when it comes to the amount of details and edge cases to handle.

Otherwise how are you supposed to estimate something? I can make you the same feature in a week or in a month. It's going to be more polished in a month, of course, but I can squeeze it in a week if needed, with limitations.

Embrace deadlines, you will love them.