Also I think what you say is more of a myth.
1) Turn-based tactics and puzzle games won Ludum Dare before
2) There are not many of them in jams not because of popularity, but because they are really hard to make
3) Just as with commercial indie games, the point is to get enough players in absolute numbers (to recoup budget or to get rated), not relative percents
4) Turn-based tactics are very very popular actually, in the form of card games :P