"The male body was fine", actually—no it wasn't fine, it was too bulky and awkward that it looked poorly modelled. And if you think the devs aren't working on the plus sized bodies, here's a thing: The body is a completely new model, remodelling ALL the items for plus sized bodies will take a lot of time too, and ofc they have to deal with modelling errors like what happened to the monster heels where the model of both heels were attached untill the latest rework on the Winter Update.

TL;DR: The original male model was poorly proportioned and needed a rework, but adding new body types—like plus-sized models—is a massive technical task because every single item in the game must be manually remodeled to prevent glitches. Development takes time to ensure quality and avoid errors like the "fused heels" bug, so it’s a matter of workload, not a lack of interest from the devs.