I’ve been using earthly a lot lately and its general value prop is simple: it turns out that if Buildkit is your primary build tool that Make targets can almost always be represented as OCI image layers. The killer feature IMO is that its syntax is familiar enough to end users of both Make and Dockerfiles that engineers tend to be willing to onboard to it. A lot of these other solutions that use proprietary DSL’s struggle to cover every use case, and the implementations in turing complete typical language SDK approach often forces you into analysis paralysis if there is no existing pattern.