It's unnoticeable when you don't reevaluate your choices. Once you get into the habit of automatic snapshots, ext4's lack of snapshotting is very noticeable.
The snapshot is also a point in time to derive backups from, and usually costs nothing to make, as opposed to making a dd image of the disk, or tarballing everything, etc.
Whether you think you need those is debatable, but it's quick and easy enough, works for me.
[0] https://github.com/jimsalterjrs/sanoid