[tatref]

Do you also feel nervous when resizing a FS that has files in use?

I've never thought about the AV scan of such a file!

[CoolCold]

For growing FS, with regular files, I'm not feeling nervous. I was at the beginning like 15 years ago, but both XFS/Ext4/BTRFS works fine.

As side note, not nervous when resizing NTFS in Windows, even for shrinking (still recommend to have backup for shrinking though).