I use parcel for "on the spot" things, experiments and prototypes.
It's just nice to get all the benefits of modern JS just by writing a basic index.html and doing parcel index.html.
But for larger and long-term stuff I would still prefer webpack. And nowdays, with webpack 4 - it's pretty easy to have a simple setup, thanks to their advances with sensible defaults.
TL;DR every tool has its job. IMHO - parcel really shines for quick bits, no need to go to codesandbox or any other service like that to have a one-click modern environment anymore.
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