Serious question: as a user (not as a developer!), have you ever seen substantial improvement in a piece of a software from a ground-up rewrite?

In other words, have you ever used (but not co-developed) something where the developer(s) decided on stopping evolutionary work and instead embarked on a substantial rewrite, and the outcome as you saw it firsthand was a real improvement?

If so, please state your example. Please stick to personal experience, rather than hearsay. Thanks!

@xahteiwi does Ceph OSD FileStore to BlueStore count?
@gurubert Well, yes it certainly counts, but in the grand scheme of things it was compensation for two prior rewrites: EBOFS being replaced with a rewrite that heavily relied on then-unstable features of btrfs, being replaced with rewrite that had to deal with the shortcomings of XFS.