What would be the most fun thing to build?
But then…
It has to be something that makes our product better, not a random technology or unrelated market.
Indeed, even for a company, it's wise to be in "Explore" mode sometimes / somewhere, in which case again the constraint might hamper ideas.
So I'd agree with you, removing that constraint could be a great idea!
But then…
:( Boo! Not so much fun anymore.