How much development time has been saved and codebase quality increased by making backwards-incompatible changes that improve things drastically? It's a balance, of course – I'm not suggesting old interfaces should be thrown under a bus at the earliest opportunity. But the super-conservative opposite does nothing for progress and ends up with excess technical debt. Varnish 4.0 is a major version release. 3.x still works and will be used by a lot of people for a long time. I really don't see the issue, certainly in this case.
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How much development time has been saved and codebase quality increased by making backwards-incompatible changes that improve things drastically? It's a balance, of course – I'm not suggesting old interfaces should be thrown under a bus at the earliest opportunity. But the super-conservative opposite does nothing for progress and ends up with excess technical debt. Varnish 4.0 is a major version release. 3.x still works and will be used by a lot of people for a long time. I really don't see the issue, certainly in this case.