Full disclosure: 3 of my top 10 are loopers are 6, 7, & 8. So, I'm likely a bit biased from the jump.
Personally, I find it difficult to compare loopers and non-loopers when I compile my top ten lists. But, on the other hand, I can see everyone's point about there being too many lists. I don't think three lists would be too many, but then again I really like data, critiques, reviews, and top lists. It is worth noting that Mitch could just have the one list, but instead he decided to separate wood and steel.
And I don't agree at all that having loopers and non-loopers opens the door up for a list for every type. I don't have the time, but I'd bet if someone went to RCDB or did some number cruching, they would find that the world's coasters are something like: 10% wood, 20% steel looping, and 70% steel non looping. These are just guesses.
Those three categories are large enough percentages of the overall coaster population to merit three lists. Again, I love polls, rankings, lists, etc. I understand that the appetite for these things is pretty varied. I can see both sides and I'm trying to see this from other enthusiasts and the gp's point of view, not just mine.
Basically, if there's a wide-reaching preference shift it doesn't quite seem fair (to me) that loopers get left out. Maybe this is just payback for all those years of OTSR headbanging.