I never said anything about grand slams being easier for Wales, it'd be stupid when two of their last three came in an even year, when Wales get a sniff of a slam they don't **** it up! You missed my edit I think, I more or less said exactly what you have in the last paragraph, it should be a bit more random though don't you think? You can't deny that it's easier to win a slam not having to go to Dublin, London or Cardiff, and if one of two teams every year have that opportunity and the other team among the contenders never does something is a bit off.
At the moment luck of the draw is absolutely huge in the six nations to the point that having a Sunday game in R1 or R4 or even playing Italy at the wrong time can be a massive disadvantage. It doesn't make sense to have the most important aspect of that luck, home and away fixtures, set in stone when the challenge could be more varied and result in the exact same number of home and away games if you ask me.