Gripes with the ending

Everything here is essentially a spoiler as a heads up.

!1. Why is the ending so rushed? They could have spent many more chapters talking about why Jin was selected. Instead, they just say it's too complicated to explain? Tf kinda ending is that. The whole story built up the fact that Solderet picked Jin 1000 years ago, just to find out that he doesn't know why himself. They provide no explanation on how he set up everything 1000 years ago for Jin, and to the very end, he still wanted Temar but had no choice since he could only reverse time 30 years. !<

!2. On top of that, I get it used Solderet's existence to rewind time, but to not even have Jin talk to him once is stupid. They kept saying Solderet's existence was weak, not completely gone, so you would expect him to actually show up at least once, but nope. !<

!3. The author had no idea how powerscaling works. Firstly, the multiverse had no hints whatsoever. On top of that, Elona was the pinnacle of strength for nearly 850 chapters, but the other dimension versions of her are essentially fodder? How can a few 10-star knights seal multiple Elonas? Even if she was 90% weakened, she would still be on par with someone like Ron when he ascended. !<

Those are only the immediate issues I have, let alone all the other plot points that just go unfinished.

I guess this can all be boiled down to the author not knowing how to end the story at all. What was essentially one of my favorite web novels, where I went through all the work to translate it, fix the errors of the translation, and wanted to release the final translations, turned into a bitter taste in my mouth. Maybe I just didn't understand the ending well, or I am just on tilt after finishing it. It's sad when an amazing story and premise get ruined by a bad ending.