Are web components worth it?

In this episode, Jake and Surma chat about web components. Why they were invented, what they're useful for, and how they would improve.
Resources:

• Surma showers his eyeball.
• The old custom elements 'v0' spec.
• The old shadow DOM 'v0' spec.
• The old HTML imports spec.
• The initial version of Polymer.
• Lit (formally lit-html).
• HTML attributes vs DOM properties.
• Issue looking at ways custom elements could have behavior.
• The ElementInternals API, for making custom elements interact with forms.
• The is attribute.
• WebKit's position on the is attribute.
• Programmatically…