I think there is a simple answer - SH3/GWX has specific climate, SH4 hasn't it.
Sailing U-boot in SH3/GWX is more interesting than sailing American submarines for me and many people. But de gustibus non disputandum est.
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SHIII + GWX 3 Gold + V16B1 hardcode fixes + SH3Commander
SHIV + OM + OMEGU
SHV + WoS
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