Webpack's general design philosophy is to dump a bag of tools on your head and tell you to use them to assemble a build system. So anytime the bag gets larger, I cringe.
I do wish there was a middle ground where you could use 90% sane defaults and customize the other 10% without taking on a huge amount of tool-specific baggage. Parcel is great for simple projects, but is not (in my very limited experience over a year ago) anywhere near customizable enough for more advanced use cases.