An extremely tight finale in my opinion, although I already see a lot of people divided on the Webby revelations. The foreshadowing was there for a while, even if it wasn't super obvious- to me it makes a lot of sense but it def ends up downplaying the found family aspect of her character that continues to be very important all things considered. While it doesn't really ruin her character, a lot of the big deal around her was that she wanted to be part of the family and was accepted into it not out of blood relation- them playing up the DNA connection at the end is a clever enough loophole for the Papyrus solution but it does cheapen Webby's original arc with the McDuck family- but it doesn't change that at the end of the day she still really is heavy on the themes of found family with Lena and Violet (and by extension May and June).
All my gripes just come from the fact the finale will be the last we see of these characters, so really my only issue is that we don't have more show. Like, yeah, I wanna see the Poe plot wrapped up but I think it's equally valid to have Scrooge still be in the wrong regarding that and it may never be resolved. Everyone's story got wrapped up but it didn't feel like it was done with a neat little bow, Bradford ended up being one of the most menacing antagonists in the series (although it should probably be pointed out that this wasn't that high of a bar- rarely did the villains on this show really cross moral thresholds with consequences). You really got a sense that Bradford was really behind everything and that there was enough ambiguity there with who killed Duckworth/how Della found out about the rocket early that you buy it in these blink and miss it revelations.
Overall, it was a good finale to a good show. I hope it has as much of a legacy as the things it was paying homage to.