Publishing a draft originally written in 2015, Remy shows Progressive Enhancement is still a strong topic all developers should understand and work on:
Developers are inherently lazy. It's what makes them/us optimise our workflows and become very good at solving problems. We re-use what's known to work and tend to eke out the complex parts that we can "live without". Sadly, this can be at the cost of accessibility and progressive enhancement.
Can I buy a phone that doesn’t use anything from Google or Apple?
The power of progressive enhancement