It's not just about hosts. In developing countries, old generation mobile phones running Android 4.x are extremely common. Google's own metrics show 26% of Android phones are pre-5.0, and that's without the unknown number that don't have Google Services installed.
EDIT: Seems the last version of Android 4 does support TLS 1.2, but there's still a non-zero amount of users on older versions.
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And those hosts ought to up their game or disappear.
The other way to look at it is that you have security vulnerabilities because a portion of the internet is stuck in a decade old obsolete world.
It's not just about hosts. In developing countries, old generation mobile phones running Android 4.x are extremely common. Google's own metrics show 26% of Android phones are pre-5.0, and that's without the unknown number that don't have Google Services installed.
EDIT: Seems the last version of Android 4 does support TLS 1.2, but there's still a non-zero amount of users on older versions.