I usually don't look much into new stuff until I've heard about it for a while and it looks like it's getting widely adopted, or I have a specific interest in it.
I didn't move into Webpack until I felt it was becoming the most commonly used bundler and I had some issues with Gulp.
So far I'm happy with Webpack and I haven't looked into Parcel or Rollup at all. Webpack solves my problems and it's still actively developed and getting good updates, so I don't see any reason to change.
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