Anything which slows you down, or lags you, or causes a chink in the chain is bad.
For example, I’ve been discovered in blogging, especially when blogging with WordPress, featured images slow me down. For example, when I have a certain concept I want to blow, I first wrote the title, I might write some texts in the body, and then when it comes to the featured image, I have to wait for the WordPress media library to load which is often very slow. Or I have to create a new image to best accentuate my idea. Perhaps then for me to maximize my blogging, I will disregard featured images for a bit.