How much of what we want to do in space can not be done by robotics? Other than the novelty of humans in space, why spend double or triple or more on the costs of manned space flight just to call it ‘manned’?
IOW, how much more exploration of the solar system and beyond could be accomplished by not spending money on human habitability in space?
Unless you want to go the way of the dino’s, we need to be spreading across the solar system & beyond. it is only a matter of time before we experience an extension level event/s. [whether natural or man made, it’s coming]