Definitely my biggest gripe is story points + estimations. It's just completely flawed. We should be thinking more probabilistic (i.e. there's an 80% chance we'll get this done in 2 weeks). We should be doing that by running actual models on past work rather than gut feelings.
If you want to listen to a couple of guys I used to work with who really know what they are talking about, check out this series: https://www.youtube.com/channel/UC758reHaPAeEixmCjWIbsOA/vid...