Well, of course, in TBTS there are many counters to WBMS and it's variants, so I agree that for TBTS I would use other things, and woudln't want to risk the spin direction guessing game.
But in TB WBMS is much harder to beat. While it is very unlikely that a match will be played exclusively in TB (or even split with TB and TBMS), if that ever occurs, RSMS is basically one of the best options against it, and because of it's ability to beat such a powerful blade in TB, it should be a must own. I would not like my chances going into a tournament if TB is the only stadium and I did not have a RSMS to counter WBMS.
But in TB WBMS is much harder to beat. While it is very unlikely that a match will be played exclusively in TB (or even split with TB and TBMS), if that ever occurs, RSMS is basically one of the best options against it, and because of it's ability to beat such a powerful blade in TB, it should be a must own. I would not like my chances going into a tournament if TB is the only stadium and I did not have a RSMS to counter WBMS.