Well yeah, like the article I linked says:

It has now been nearly eight years since the “experimental” tag was removed, but many of btrfs’ age-old problems remain unaddressed and effectively unchanged. So, we’ll repeat this once more: as a single-disk filesystem, btrfs has been stable and for the most part performant for years. But the deeper you get into the new features btrfs offers, the shakier the ground you walk on—that’s what we’re focusing on today.

So if you’re just using it for your PC hard drive you’re probably fine. The problem is that BTRFS is intended to provide similar features to RAID and ZFS, but that’s where it starts failing.