Wow, Duci, I wasn't even aware!
I got SH4 way back out of solidarity to Ubi, and the Genre, but I never really got into it, since I'm not much of a Fleet-Boater.
And combing the cluttered SH4 Forums was kinda a pain. And I didn't have the time to Start following yet another Modding endeavor to the point of understanding it like i do SH3.
But you're right of course; It really seems that we can easier put SH3 into SH4 that in SH5.