Then, in frustration, I rebooted into my Windows partition, which I rarely ever use. to see if I could back up my stuff and figure out why I wasn't having the same reboot problems in Windows.
After trying a bunch of Btrfs repair commands over a bootable usb disk I found online, I hit a wall with some errors that couldn't be fixed. So, I threw in the towel and reinstalled my system with ext4. It's been running smoothly for three weeks now with no more error headaches.
Could not find the logs of the errors anymore unfortunately to report.
Not like, "hehe we need to sync", but "good luck repairing, enjoy probably formatting"
LVM/MD RAID, ZFS, etc all behave fine. Only BTRFS is this fragile.
Looks like kicking the tires will remain somewhat in the future for me.