If it's so hugely beneficial. It would be done or in the works but it's not? So we need to consider there are reasons. Your asking why it's not being done and I am giving you answers which your now saying are not valid. OK so your trying to argue thay the ISS is in desperate need or large steel structures? For what and how will it be assembled?

Water is a valid point but do you think designing an entirely new launch system just to bring water into space is economical.

"It's hugely beneficial for Artemis mission". Can you go into some details here about why Artemis needs to have a massive amount of stuff launched along side it? Does the mission not already have everything needed for success loaded onto a single rocket?