What if you could drop your captured piece as an enemy piece? Will the game become easier or harder?

There are amount of tesujis in shogi where you sacrifice your own pieces to bloackade your opponents' king from fleeing. It comes to me that if you could drop a piece for your opponent, it will also be a blockage since capturing a friendly piece is not allowed. So I think this might be a quite interesting variant for the game. Note that other handicaps like far-rank drop and nifu still hold.

As far as I'm concerned, this rule can be applyed either to attack by occupying an important square of your opponent, or to defend by blocking a long-range attacking piece. However, these tactics success only when the dropped piece has no (good) square to go, and I'm not sure how often this will happen.

Another case is that you could prevent your opponent from dropping a pawn on a critical square by dropping a pawn for him in advance the same file.

I am now wondering whether this variant can make a difference to the game. Does this variant ever exist? If so, does it have a name? If not then why, by accident or ​is it flawed?

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That's a very good idea. And I have noticed two concerns. The first one is the possibility of forcing the opponent to commit a violation. For instance, there are illegal moves like double pawns or drop pawn mate. However, it would be best to consider this as a violation on the part of the player who dropped the piece.

The second concern is the potential for the game to become very dull. After exchanging rook pawns with P26 P84 P25 P85 G78 G32 P24 P24 R24 from the initial position, if Black drops P28, White would be in serious trouble. We need to come up with new tactics.

Lastly, I've also realized there's a challenge with notation. There will be discussions on how to denote dropping one's dropped piece as an opponent's piece. However, I believe this issue will be resolved soon.

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