It is logistically impossible for the congress to work as quickly as Trump did in his first month.
The House successfully voted to repeal Obamacare 6X during the Obama administration despite knowing Obama would repeal them. Where are those 6 bills? They have already been through the process you described. Why aren't they already on Trump's desk?
They voted to repeal Obamacare - not replace it. Trump has said he would replace Obamacare and that is a bill that impacts 1/6th of our economy (healthcare).
Because Obamacare became law and went into effect there are now millions of people insured through it. Simply repealing it up would probably leave millions without insurance - a PR nightmare of all PR nightmares.
Trump correctly said it had to be repealed and replaced at the same time. The bills you reference from the house GOP repealed Obamacare, but I don’t believe they addressed people already in the program. We all support getting rid of Obamacare because it sucks. However, Trump is taking the long view and he wants to replace it with something that works (his words) that include common-sense market reforms to lower costs.
I do agree with you that it is disappointing that the GOP was not ready with something right out of the gate for Trump to sign.