Regarding the mind-bogglingly amazing answer by @MartinR, a real-world example - it's the #1 call in our standard utilities files these days:

// The incredibly important `.Typical` call, used literally everywhere in UIKit.

import UIKit

extension UIView {
    
    ///The world's most important UIKit call
    static var Typical: Self {
        let v = Self()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .clear
        return v
    }
}

It's ubiquitous.