Yep. Never had much hope for Star Citizen and only moderate interest as a consequence, but my particular remembrance is some random line in one of the dev updates a while back. It mentioned how environment humidity would affect character endurance. Coming on top of many, many similar lines, that was pretty much the "yeah, this isn't going to work out" moment for me. It's stuck in my mind as a one-liner memento mori of sorts ever since.
Mine was their video of how they decided to spend months building their own headview algorithm instead of using the industry standard. The best part was that their end result is comparable and wasted months of effort getting it.