Ranging rook openings may be a bit overrated or their advantages not well understood scientifically. Best bet is to analyze
how high-level AI programs play and respond to ranging rook openings, since these programs are superior to human
players. The emphasis in shogi openings is usually defensive, with players being careful to work on shoring up defenses
and making sure that each piece, particularly pawns, are protected, often by moving generals to the second rank. Moving
a rook is often of minor importance in the opening, although sometimes an opening is played where a rook pawn
is advanced far enough to be captured by the opponent's pawn, after which the rook moves to capture the opponent's
pawn. Castling can be overrated as well. The problem with castling is that multiple turns are needed to form a castle,
and these turns instead can be used for shoring up defenses, or for low-level offense attacks. There is the opportunity
cost of using up turns to form castle structures, versus using those turns to shore up defenses or to attack. However,
if an opponent is using up many turns to form a castle, a player may not incur a tactical disadvantage by also using
up turns to form a castle. One should not automatically form a castle, but evaluate the cost/benefit of using up turns
for forming a castle at a particular point in the game. High level AI players seem to go against classical theories in
some situations.