When I say design flaws, yes, I mean those little bothersome parts, but also referring somewhat to the bet system where a car seat is rated as a Poor Bet, Worst Bet, Fair Bet, etc based on their versatility. Or none at all. Some car seats have so many design flaws they're not worth buying, and maybe the people who do buy them forgot to do their homework first on vehicle fit compatibility and how it fits their kids, long term. And then I feel there is one car seat that should be recalled, and never sold again: Baby Trend Hybrid 3-1. Just what I've read about it on blogs, here on this forum, and thumbs-down reviews on YouTube, it seems like the BT should be first to go out of many seats. I also think that Graco should raise the forward facing age limit to 2yrs and 25 pounds, like Britax does, and that they should revise their booster mode age to 5 years, 40lbs, especially for the Nautilus and Argos. No 3 or 4 yr old should ever be in a booster, that's why the Nauti has that great long lasting harness weight/height limit, but it's like Graco could care less about contradicting themselves and putting kids at risk of lap belt/shoulder belt discomfort --let alone more pain from hard stops that backseat passengers CAN'T ANTICIPATE, aka children who don't have word articulation for "headache" or "skin hurts". Maybe I'm living in a fantasy world where boosters are for 40lbs/3'5" / 5yrs and up. Simultaneously at that too. Or maybe CSFTL.org is absolutely right, that harness seats are built with 3-6year olds in mind, thus there's no logical reason to skip the harness and booster at 3/4/5.
Sometimes I'm extremely too far obsessed with car seat safety, I frighten myself.