No, I think my examples are good. Luke was up against an interstellar empire that had men, materials, and technology sufficient to blow up worlds (take THAT, Shiggy!) and was being guided by the embodiment of the Dark Side. Harry was up against not merely Voldemort and the Death Eaters, but at the end the suborned Ministry of Magic. The odds were woefully against the heroes.
Now look at the case in BnHA. The bad guys have Shiggy, ReDestro, Giga, an uncertain number of Nomus, lots of money, and thousands of quirk users, including Twice if he starts the Sad Man Parade again. Focus only on Deku and it's hopeless. Even Deku and class 1-A isn't much better. Deku and all of UA, with its massive resources and pro and in training Heroes, is a lot better balance. Then expand the picture to include ALL of Hero Society - the government, thousands of Pro Heroes, millions of quirk users - and it's clear, Shiggy and Co are STILL the underdogs. Not by as much, but unless they pick and choose their battles carefully, and maybe can get AfO and Kurogiri back, they're in real danger of getting BTFO.