Personally, i have never experienced problems while reading from USB sticks, but i have while writing. I have a 15+ years old USB2 stick and a new USB3.x stick. The USB2 stick writes with constant ~20MB/s, while USB3 is all over the place between 200MB/s and ~0.1MB/s. Unusable for me. For a while i used external HDDs and SSDs over USB3, as they somehow run without problems, but they are cumbersome and expensive.

Therefore i have switched to transfer files over the network (for large files i plug in Ethernet) using KDE connect. Unfortunately it can not send folders (yet), so i would .tar them before sending, and untar them after.

LocalSend would also be an option. Maybe that can do folders natively.

I am running BTRFS on multiple PCs and Laptops since about 8-10 years ago, and i had 2 incidents:

1. Cheap SSD: BTRFS reported errors, half a year later the SSD failed and never worked again.
2. Unstable RAM: BTRFS reported errors, i did a memtest and found RAM was unstable.

I am using BTRFS RAID0 since about 6 years. Even there, i had 0 issues. In all those years BTRFS snapshoting has saved me countless hours when i accidentially misconfigured a program or did a accidential rm -r ~/xyz.

For me the real risk in BTRFS comes from snapper, which takes snapshots even when the disk is almost full. This has resulted in multiple systems not booting because there was no space left. That’s why i prefer Timeshift for anything but my main PC.

Tipps to prevent future accidents:

• Set up BTRFS snapshots with Timeshift or Snapper. Switching to BTRFS is worth it for snapshots alone.
• Do regular backups on a device that can not be reached by rm: vorta local on external hdd that you connect once a week OR vorta/borg2 to a NAS/Server that does BTRFS snapshots itself OR Nextcloud to sync to a server that has a trashbin OR git to a server. Just remember that Nextcloud and git are unencrypted, so the server has to be secure and trustworthy. Vorta and borg2 can be set up with encryption.

Mistakes are unpreventable due to our error-prone brains, but it is a choice to repeat them.