As a theorist, it's sort of true that I "don't care" about galactic constants. I'm interested in the structure of computation for philosophical reasons. But I really do care about the model of computation.
To put it another way, the constants inside a big-O are not really constant: they depend on what you assume is a constant-time operation.
To put it another way, the constants inside a big-O are not really constant: they depend on what you assume is a constant-time operation.