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It's really just an evolution of the original Structurizr for Java library that I built 5+ years ago. Some people really liked the ability to create a model+views using a programming language (ports are now available for .NET, PHP, Python, TypeScript, etc), but many thought it was silly. So I've always wanted to do something "text-based", but I wanted to do "models as code" rather than "diagrams as code". The lockdown in 2020 gave me some time to do this, and the DSL is really just a thin wrapper on that original Java library. Being a wrapper for the Java library provides a way for you to create parts of your model via scripts (Groovy, Kotlin, JRuby) or by mixing the DSL and code. This creates opportunities for manually defining a high level model, and then perhaps inserting a deployment architecture that's automatically generated by parsing AWS/Azure/Terrform/etc.
I'm not aware of anything that's quite the same either. Visual modelling tools do the "model + views" thing, but you lock your data away behind their UI. C4-PlantUML provides a "C4-ish" DSL, but it's diagram focussed. pumla is an attempt to turn C4-PlantUML into something model-based, but it looks quite complicated. Archinsight is another text-based DSL, but it's not as full-featured as the Structurizr DSL and surrounding ecosystem.
I'm not aware of anything that's quite the same either. Visual modelling tools do the "model + views" thing, but you lock your data away behind their UI. C4-PlantUML provides a "C4-ish" DSL, but it's diagram focussed. pumla is an attempt to turn C4-PlantUML into something model-based, but it looks quite complicated. Archinsight is another text-based DSL, but it's not as full-featured as the Structurizr DSL and surrounding ecosystem.