In reality, it the resin code was a deliberate attempt to confuse consumers by the plastics industry to prevent consumers from making an informed decision to move away from plastic packaging on the grounds of it's bad for the environment.

Similar to how the junk food industry is all about telling people to "balance what you eat and what you do", and shrinking portion sizes while also selling "shareable" packs. They are trying to avoid customer ire and/or regulations against them.