[zuzululu]

You cant spec out what you dont know, scope, requirements change from real world feedback

[reg_dunlop]

Then adjust the specs with the scope and feedback.

I fail to see the argument you're making...

Features aren't made in a vacuum. If specs are made/written....with the information available now...then it's better than not writing specs.

Writing specs with incomplete information is better than not writing specs with incomplete information.