...because, among MANY other reasons, the stage is selected prior to character selection; therefore, there is no way to mandate that the stage is 'acceptable' for the matchup, nor should there be
should we have an 'all-stages-legal-for-dittos' clause?
which is why i proposed a system where you can avoid this issue entirely:
what if we switched to the following procedure for everything after the first match?
loser introduces two stages from non-neutral list (what is currently our CP list plus a few more. read on and you'll find out why this is fair)
winner picks character
loser picks character
stage strike to choose stage
I'm sure there are disadvantages this system, but it brings the advantage that you would never have to play on a stage where your character is pretty much screwed against your opponents character and it would allow us to bring in certain stages that are totally unfair for certain matchups but totally legit for other matchups. (fox dittos at corneria?)
In this scenario, IC players never have to go to brinstar against peach only to have their nana get killed once peach splits the stage. On the other hand, we can also have jiggs vs peach at brinstar since the lava isn't terrible to either character.
.
Example:
p1 vs p2, p1 used falco to beat p2, who used jiggs, in the first match.
p2 decides mentally, "i still want to use jiggs for the second match, so i want to add stages to the stage strike list that are advantageous to jiggs"
p2 chooses brinstar and RC to add to the stage striking list. Now, the stage striking list is RC, brinstar, and all of the neutrals.
p1 and p2 stage strike from said list.
If p1 still wants to play falco in the second match he never has to play on brinstar and RC if he doesn't want to. All he has to do is strike those stages.
p2 still gains a slight advantage for the second match, but only since p1 has to use 2 of his stage strikes on RC and brinstar, in addition to probably DL 64. Thus, p1 has less of a say in where they go for match 2, but he can still prevent the match from going somewhere where is he is at a severe disadvantage.