Why does the debt ceiling debate matter? Predictable cashflows. Think about it: if your bank couldn’t be sure that you were gonna make your mortgage payment next month, it would - if only on the margins - think twice before reducing its liquidity buffer on other investments. Now apply that to the biggest borrower in the world: the U.S. government 
Discussion
As long as the US can forcibly export their inflation to other countries, they will do it. This “debt ceiling” is an aphorism for the exportation of inflation in exchange for real commodities and labor from third would countries, using the military and banking systems as strong men.
There is no debt ceiling. The debate about whether we should owe more or not is just a distraction for people who want to think that government obligations follow the same rules as private debt obligations.
They obviously don’t follow the same rules, though. Whats your point? I was just offering an explanation of why the debt ceiling matters in terms of liquidity