Advantages

By avoiding implementation class inheritance, the design naturally encourages composition and aggregation, leading to simpler, more maintainable code. This prevents the project from becoming an unmaintainable mess like many Java and C# projects that lean too heavily on inheritance, which can seriously put at risk business continuity. https://gist.github.com/Sedose/978e0670c43dd8e904d2b479b49961b8
Interfaces are implicit and satisfied automatically, reducing boilerplate and improving decoupling.
Fast compilation and single static binary output make builds and deployments straightforward.
Simple concurrency model with goroutines and channels makes writing concurrent code accessible.
Minimalist core language reduces cognitive load and improves readability across teams.
Standardized formatting across all codebases via gofmt ensures consistency and removes bikeshedding.

Disadvantages

Verbose and awkward syntax (compared to e.g. Kotlin).
Limitation of generics (even starting from Go 1.18) led to widespread code duplication and awkward workarounds. Even with generics, the ergonomics and type inference still lag behind more expressive languages. golang/go#49085 (comment). https://go.googlesource.com/proposal/+/refs/heads/master/design/43651-type-parameters.md#No-parameterized-methods.
Limited support for functional programming constructs. The culture of Gophers is to use imperative lops, ifs etc -> code is not expressive

The absence of classes implementation inheritance outweighs ALL other shortcomings, as it enforces composition and aggregation by design - greatly reducing the risk of long-term architectural degradation and helping ensure the project remains maintainable over time, clients stay satisfied, and business continuity is preserved without abrupt failures or costly rewrites. This is one of the most critical and foundational aspects in software development.

While there are many other languages w/o classes implementation inheritance like Zig or Gleam, Go is the most popular among them according to surveys e.g. https://survey.stackoverflow.co/2024/technology.