Review Detail of jckars in End of the Magic Era

A nice read, but honestly the plot is full of logical flaws. According to the storyline he spend in the far future 20 years. Only 20 years but during that time he was able to gain extreme knowledge even of detailed spells etc, been able to be extremely skillful in combat, in technics, in alchemy and so many more fields. It was just 20 years in a post apocalyptic world where survival was the most important thing, yet he managed to make it to the peak? In case of nie lie he stayed 1000 inside the temporal deamon spirit book so he had the time,Zhang Xuan can get the entire book just by touching it or looking at it but how did this MC gather all this knowledge while hunting for some food or little bit of mana? 2nd and most important is to be able to read and critise with such ease books for grand mages, even wanting to check books of high mages to check for flaws would mean that on the far future he was at least an archmage. But how could that be with actually almost zero mana on the world? Even the descriptions of the world mentioned that no more high mages could be produced or sustained and all fell due to the luck of mana. But if he could not advance then he could not be able to understand the books of high magic much less critise them. Solon mentioned that a mage could not even understand the meaning of the Runes,much less decipher the entire set of the tomes, for the high mage books. Even the magic whirlpool to be created needed a huge amount of mana (the way MC did it) so how could even reach mage level with that pathetic sparse mana of future world? However, even his expertise in alchemy signified that he was in an archalchemist level before. But a peak alchemist needs to be a peak mage as well according to the book. Still author said a couple of times that future world had no more peak mages. They were all in the cemetery at that point. And finally.. It's been many times already that MC mentions about merlin's body's flaws and it is because he did not have a mana baptism like they started doing in the future. Still though, in his future there was no mana baptism as well.. Dragon's blood could not be found anymore, so didn't his future self have bodily flaws that prevented his advancement? Not to mention that he seems so familiar creating potions with resources already extinct in his future time (the correct timing and handling of them) that feels like either he has Leylin's chip or Zhang's library to calculate the exact doses, temperatures, time needed etc. Similarly he is so skillful in casting spells that require much mana like he has cast them hundreds of times in a world with almost no mana. I do enjoy the development of the story... But the background is not convincing. It would be more convincing if he was one of these peak mages that rivaled gods, lived thousands of years and managed to stay alive until the very end. That would somehow explain his vast capabilities and confidence.