[LaPingvino]

No, the documentation stated that Go was designed for reading without backtracking. That results in single pass compilation being possible and thus being faster, but that was never a limitation that was imposed. The reading without backtracking is still valid: go generate DOESN'T work on .go files, only on any other tool that generates .go files.

About the second part, you seem to mix up goroutines and channels. In a concurrent system, you would need locks for your example, and channels fix this. Goroutines are just the representation of independent processes and can be implemented and ARE implemented differently per compiler, check e.g. how tinygo and gopherjs do this.

Your example point 2 doesn't make any sense, check fan in and fan out patterns with channels. Go supports message passing, that is what channels are. You really didn't try Go and it shows.