None of that really breaks the previous established rules of the lore, justu, and chakra. Guys have been spamming chakra taxing Justus since part 1. Naruto has been spamming clones forever. Neji while supposedly near out of chakra and on deaths row was able to hit Kidomaru multiple times with the gentle fist with Byakugan active. Kidomaru himself was spamming his attacks with no signs of slowing down. Haku had his crystal ice mirrors active for hella time and the only reason it stopped was because Naruto broke the mirrors himself. Kakashi and Sasuke are really the only characters who showed some sort of limit to their chakra reserves, and for Sasuke that ended when he achieved the second stage curse mark. Madara being stronger than the other characters doesn't break the rules of the series.
Naruto was spamming one jutsu in part one, but MANY MANY MANY time they say it's because it's Kyubi, and he is a power house.
Neji has no chakra at the end of the fight with the spider guy, that's the reason why he wins, because he resorts to a almost chakraless skill.
Many times we have seen characters like Jiraya, Tsunade, Kakashi, the Kages, reaching the end of their skills.
Even in the Sasuke vs Itachi fight, they use a limited amount of jutsus.
Haku move is such small scale, we have gaara lifting oceans of sands and getting exausted against Deidara, but during the war he does whatever he want.
Come on.
Madara is not "stronger". Madara no diffs the whole verse.
Madara is like if Goku arrived in One Piece world after the Boo saga.