I can't believe they're saying the chest latch isn't important... Unbelievable. This is really disappointing, this was the car seat I was going to get!
7 On Your Side investigates safety concerns of a popular car seat
https://abc7news.com/shopping/7-on-your-side-investigates-safety-concerns-of-a-popular-car-seat/1081858/
Re: Uppababy Mesa Carseat - safety issue
2. A chest clip is a positioning device and a lot of the time they break in an accident. They are there to keep the harness straps in the correct place.
3. If your kid can undo the chest clip there are several tricks to try (a button up shirt over it, for example)
Baby Boy due October 2017