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The reason why some v.2.0 MGs are shit is because they are already tooled decades ago.
some of them have probably been tooled since 1.0 days and just updated partially to 2.0 standard (definitely the R3 line, MG Gundam MK.V, The O and any MG with 2.0 body with 1.0 pelvis)
Heck, there was already a prototype of PG Unleashed Gundam shown in early 2000s Gunpla Expo