This issue tracks improvements and missing features of submodules:

• Recipes can depend on recipes in parent or sibling modules
• Variables defined in one module can be referenced from another
• Inline modules #2442
• Share settings between modules #2271
• Allow submodules to load .env files
• Variables defined in a submodule should be overridable on the command line #2119
• Make all errors, not just compilation errors, refer to module source file path as appropriate
• Make just --show work with modules
• Aliases to recipes in submodules #2629

This thread should probably be used for general discussion. If you're interested in one of the above features, mention it in this thread and I'll create a dedicated issue for it.