https://www.theatlantic.com/entertainment/archive/2019/07/veronica-mars-season-4-finale-twist/594523/

Past Veronica characters have been sent off in thoughtful and satisfying ways, from Logan's mom to Duncan Kane to Meg. The big Season 4 twist, however, felt rushed. The twist, says Shirley Li, was a "deeply cynical way to end a season that—unlike the fan-service-inundated film revival from 2014—was largely a return to form for the series. What’s more, it’s a curveball that cheapens the evolution of one of the show’s most fascinating characters."

ALSO:

Veronica Mars is and always has been a noir tale, and that's why the twist makes narrative and emotional sense (https://www.themarysue.com/season-4-veronica-mars-delivers-satisfyingly-noir-finale/)
The last five minutes of Season 4 doesn’t feel in line with any decisions the show has ever made, even in its darkest moments (https://www.polygon.com/2019/7/23/20704061/veronica-mars-season-4-ending-hulu)
How was the Veronica Mars episode written by Kareem Abdul-Jabbar? (https://tv.avclub.com/with-kareem-abdul-jabbar-behind-the-wheel-veronica-mar-1836629125)
The original Veronica Mars was way ahead of its time (https://www.cracked.com/article_26554_veronica-mars-was-way-ahead-its-time-yet-crazy-dated.html)
Nine lingering questions about Season 4 (https://www.vulture.com/2019/07/big-little-lies-season-2-all-our-lingering-questions.html)
Ranking every returning Veronica Mars actor (https://www.vulture.com/2019/07/veronica-mars-season-4-returning-characters-ranked.html)
All 72 Veronica Mars episodes, ranked from worst to best (https://www.vox.com/culture/2019/7/1/18629459/veronica-mars-ranked)