Sorry, bit this is just the standard "boil the frog" playbook that tech companies always use for user-hostile features. It's usually:

1) There is this new entirely optional feature, but it's not relevant to you, so feel free to ignore it.

2) The feature is now active by default, but no worries, there is a simple button for you to opt-out.

3) The feature is active by default, but because we value our users, there is an option in the advanced settings to deactivate it.

4) Our data shows that 99.9% of users activated the feature, but if you belong to the handful of diehards who still refuse to use it (rolls eyes), you can use this obscure command line flag or about:config entry to turn it off

5) Managing opt-out infrastructure for the feature has significant maintenance and security cost that we feel, we can no longer justify. Therefore, effective in three months, the opt-out flags will stop working and the feature will become mandatory. According to our metrics, this will affect 0.0001% of our users, so no disruption is expected.