but I don't like how you can dismiss powerlevel concerns as if they aren't valid and an important part of making the world and story believable. Yajirobe is just a random wildling - not someone who's been shown to have particularly great potential like Freeza, Broly or Gohan, nor someone who's been shown to be very competent and diligent in his training - who's coincidentally stronger than hundred year old sages like Karin and Roshi. That's just not powerlevel nonsense, it breaks suspension of disbelief.
Because power levels aren't interesting to me, nor are they ever shown to be consistent. We're supposed to be amazed at feats of power like the ability to destroy a planet, but we're shown that as early as the 21st Tenkaichi Budokai when Muten Roshi is able to destroy the moon! It's storytelling, not an RPG. Yajirobe isn't shown to be Goku's equal. He's strong, and helpful at times, but he's not shown to be Goku's equal. Why do you keep claiming he's as strong as Karin and Muten Roshi? How does he demonstrate that?
The purpose power levels serve is to show that the Saiyans and Freeza's men only have a mechanical grasp on the concept of ki, not the fuller spiritual side. That's an opinion of mind that's changed over the years. I cared way too much about the RPG like adherence to rules and not enough on things like themes, catharsis, story vs. plot, and set ups and payoffs.
Another opinion of mind that's changed is regarding filler. I didn't mind it when I first watched DBZ, then I read peoples opinions and let that influence me far too much. I've said on places including here that stories should be well integrated and only be as long as they need to be. I think that was a mistake. Those are dogmatic rules and place too much emphasis on plot. After nearly 2 decades of episode orders getting shorter and shows becoming more serialized, I see the limitations of that structure as well. Now I take things as they are, and as long as I enjoy them, I don't care as much if things stay "on plot". Some filler is great, and some "canon" is boring.
The biggest truths aren't original. The truth is ketchup. It's Jim Belushi. Its job isn't to blow our minds. It's to be within reach.
"You miss 100% of the shots you don't take - Wayne Gretzky" - Michael Scott
Happiness is climate, not weather.