The "Data Saver" option isn't just a boon for battery life, but also for privacy. But, as noted when you turn it on, it does break some sites.
It would be great if this could be toggled on globally, but then overridden on a per-site using the "Website Settings". Otherwise, when a website is encountered that doesn't work with Data Saver, the setting needs to be disabled for ALL sites, and then the user needs to remember to turn it back on once finished.