Of course they're seeing "nuances". The whole thing was a carefully crafted wedge issue upon which the Republicans could scream and shout. And ridiculously, they were screaming about a health care bill based almost entirely on a Republican health care bill -- RomneyCare.
But the ACA is government intrusion! (Actually, it is, in a good way.) It's dying! (CBO says it's stable, though it is having issues in some Republican-based states who fought it in the first place.) It's raised my rates! (It's true that rates have increased, though not as much as rates would have increased without it. And part of that is through elimination of "insurance" plans that some people paid for that covered basically nothing at all.)
Regardless, now that the Republicans COULD pass the same bill, they're stalling why they try to figure out the actual political impact of kicking millions of registered voters off the ACA and off of Medicaid, not to mention dramatically raising insurance rates for millions of others.
So much for "more people will have more access to more affordable health care."