>>109258160I've said it before, but I'll say it again:
The distinction between plot/gem episodes and filler/townie episodes is arbitrary and vague at best, completely pointless at worst.
There are many episodes in the series which are townie-focused, but contribute to the core plot nonetheless, as well as gem-focused episodes which don't have much to do with the core plot at all.
My favorite case study is probably Mr. Greg, which I'm pretty sure most people would consider an essential watch, and yet, when you think about it - it contributes NOTHING to the overarching plot, exclusively concerns interpersonal relationships, and has very little importance down the line, as far as topping diamonds and resolving rose's conspiracy is concerned.