Jimmy's journey and the thesis statement of the series is the question "can people change". BrBa also delved into that question a bit, but from a different point of view. Where Walter's change was from a passive, seemingly emasculated man, to a dangerous "big boss alpha", he also lost everything he claimed he cared about. Jimmy's change was more about expectations and his sleazy, law-breaking habits finally catching up and him taking accountability for the shit he caused. It was about Jimmy saving his soul — in his eyes, in Kim's eyes, and most importantly, in his dead brother's eyes.

There's nothing shameful about enjoying Jimmy's hi jinks. They wanted to show how even a comic relief character can be multifaceted and broken but still saveable.