Bivvy-bag, tarp, hammock - all your options covered, and weigh less than most tents.
I keep seeing this viewpoint promoted, but whenever I do the research it seems to be a self perpetuating myth.... or perhaps people are comparing high end technical gear on one side with cheap as chips gear on the other? (or, Im a fool and cant add up, which is always a possibility!)
A zeph 2 is ~ 1.6kg, compared to say the DD offering (3x3 tarp + frontline hammock) coming in at ~ 1.6kg. Im ignoring the debate about UQ's+bags v Mat + bag, since the weights are broadly similar until you start splashing cash on quite technical gear.
It seems to me as Mr Average that the hammock/tarp debate is more about the experience than it is about weight savings. Once you've decided how you like to enjoy the outdoors, thats the bigger driver.
PS. Bivi's make for huge weight savings, no doubt about that.