Might be. My linguistics is super rusty. Today’s quest began with a passing thought earlier; “what is the universal mood of might/could/should/might’ve been/wishes, wistfulness and pleading with uncertainty?” – and got reminded that English is the impoverished language in that regard, making English’s minimalist irrealis a likely prototype for a really basic universal.
English imperatives are just commands: “Do the thing”.
English hypotheticals start with “could have”.
English permissives start with “may”.
English precatives start with “would you”.
English volatives use modal verbs like “Would it” or “May they”.
English interrogatives end with a question mark.
That said, it’s a fascinating exercise in thinking.