Doesn't CLI use MCP (if need-be) ? I think you might attempting to say "Neat, discrete buckets of work?" (i.e., MCP - similar to HTTP in that work is broken into discrete canonical buckets), or "Virtually unbounded work made available via various CLI utilities?".

I would pick the second option. CLI.

However, for CRUD B2B SaaS I think MCP works fine (if not better than CLI).