To those unaware, the US series of devices (running Snapdragon, specifically) don't get access to bootloader unlocks at all. Bypasses and tokens to unlock it keeps getting patched, not to mention are risky. When a device is EOL, when Samsung will no longer offer major upgrades, they should offer an update that lets individuals unlock their bootloaders. Period.
Better yet, make it like Exynos phones and allow people to do it anyways. Please stop pandering to carriers and stop restricting our devices!
So pretty much even unlocked phones don't have an unlocked bootloader. An unlocked bootloader lets you flash custom software, it isn't a hardware restriction at all.