The problem is not whether the coin can be mined on the computer or not, but how the profitable. And I don't think that personal computer mining is a good idea.
That is right what you said people focus only on coin if it is profitable or not, even though it can be mined on computer or not as you said. But more than that mining is not easy as expected, for doing that you need to have good equipment, the best system and also electricity, l don't think that everybody can do it.