This task is about changing how the Automatic Topic Subscription feature is configured such that //only// new accounts become automatically subscribed to the discussions they start and comment within.
Context for this change can be found in the `===Background` section below.
=== Requirements
1. On wikis where Automatic Topic Subscriptions is available within the `Discussion tools` Beta Feature:
-- **All people** who already have the `Discussion tools` Beta Feature enabled, should see the `Automatically subscribe to topics` setting within `Special:Preferences#mw-prefsection-editing` --> `Discussion pages` **DISABLED**
2. On wikis where Automatic Topic Subscriptions is available by default (read: the functionality is available regardless of the state of the `Discussion tools` Beta Feature):
-- **New people/accounts** should see the `Automatically subscribe to topics` setting within `Special:Preferences#mw-prefsection-editing` --> `Discussion pages` **ENABLED**
-- **Existing account holders** should see the `Automatically subscribe to topics` setting within `Special:Preferences#mw-prefsection-editing` --> `Discussion pages` **DISABLED**
//This chart is an attempt to communicate the requirements listed above in a more visual way...//
|Availability of Automatic Topic Subscriptions|`Automatically subscribe to topics` setting (EXISTING accounts)|`Automatically subscribe to topics` setting (NEW accounts)
|---|---|---
| Beta Feature| DISABLED | DISABLED|
|Available by default|DISABLED|ENABLED
=== Background
In T290508, we conducted a [pre-mortem](https://en.wikipedia.org/wiki/Pre-mortem) to identify and plan for potential scenarios where a particular project (in this case, Automatic Topic Subscriptions) could fail.
One salient concern that surfaced through this exercise was the potential for Automatic Topic Subscriptions to have unknown impacts on wikis' health and culture and the individuals that contribute to both. Where "impact" in this context refers to things like: 1) how Automatic Topic Subscriptions could increase the cadence of conversations and 2) how people might lose sight of important notifications because the number of "Notices" people receive increases more quickly than people are able to develop strategies for managing them.
Considering the risks noted above, we think it is important that we – staff and volunteers – have the "time" to observe the various social and cultural Automatic Topic Subscriptions are having and when necessary, identify strategies for adapting to them.
In line with the above, Automatic Topic Subscriptions will – for now – be made available by default to new accounts in order to increase the likelihood that they be made aware when other people are talking to them (this is a known issue) and as an opt-in setting for existing accounts.
=== Done
- [ ] `=== Requirements` above are implemented
- [ ] QA verifies `=== Requirements` above are implemented as expected