Simere wrote:3. Endowed Power: Actually receiving a tangible power boost from hope and love. The ultimate cheapening effect. I admit I might be being too sensitive about this; it might not have actually happened this episode. But when Goku's speed improves and Piccolo says "It's because of our hope"...my frustration thinking about how absurd an idea that is kills it for me. I become Jiren in these moments. Meaningless! Ridiculous!
I don't think it's that. I honestly think that the prospect of everyone dying just pushed him further, it's just relayed to us in a super poetic way because it needs to stand in contradiction to Jiren's world view. Not to mention that Toppo's reaction help drive home another point "Oh, so he does care about others." This, again, is to place him as Jiren's opposite. Jiren is a hero, but he doesn't care about others; Goku isn't a hero, but he does care about the people in his life.
Similar to what you've said about a convert's zeal, I feel like DBS has been doing something like that too. Toriyama has mentioned at least once how he was never quiet satisfied with how the anime previously portrayed Goku, in that he was bit too righteous, and it seemed DBS was out to correct that. As a result, they may have gone just a bit overboard with his careless, selfish side. When he does show feelings of care and affection, we're all a bit surprised.
*Another problem I have with nakama power is that it often feels patronizing to the nakama characters. Sometimes it makes it feel like their only purpose is to be a nakama battery. And maybe it is, but to have them acknowledge and accept that while smiling and nodding along?
Comes with the shonen territory, I'm afraid. You mentioned that Goku's not the only one to receive a power boost from thinking of loved ones, and yet why is he the only that makes it this far, and to that I can only give a cynical response : because he is Goku. The friendship boost was just that a boost; even without that he is still at least a level above the rest in terms of pure skill and power.