1. U cant standardize its use, diff model hav diff in universe height. Some r 25m some r 15m how r u gonna make up for the missing 10m? If u gonna ignore this height and make it standard across the range then it wont be 1/100 scale model kit anymore. If u r gonna compensate it by adding some extension (dumb idea more moving parts = more unstable) then why do u bother making it standardize in the 1st place?

2. There r already similar range of product line as the above description, why would Bandai introduce something so similar to cannibalize its own market?

3. MG is the preferred line for customization due to its size and it comes in gazillion of individual pieces for easier customization. Can u chop off an RG arm n implant it on others? MG can to a certain extend bcuz we can take the frame apart and make it work. We can chop it off, put in suitable joint, kitbash it, resin base, paint it in rainbow, u name it. Keyword here is flexibility, im not talking bout structural flexibility here im talking bout customization flexibility.

what advantage does a single pre build frame has on a technical level? Easier and time saving its all personal level thats not advancement thats appeasement.