I dunno... I absolutely hate that they split Arthur's seasons in half, but you get 5 episodes uninterrupted both in the fall and spring. It's like the neatest, cleanest way to do it. Everything else just gets random new episodes premiering when they feel like it.
Now that I think about it, making the show weekly does make sense, but it gets deeply into the rerunning problem. 4 rerun episodes a week, and the new episodes are filled with reused footage. I'm sure most of it is PBS's fault, and they desperately need to bring back kids' programming pledge month.
That said, every time I wind up flipping through the channels and seeing an Electric Company, it's always the same 3-5 episodes.