It seems very rare, if ever, that people create sub tasks with the intention of tagging all the same projects, assignee and subscribers.
There are a number of things we know we never want to inherit:
- T209799: Create subtask should not open new task with deadline form
- T220835: Exclude specific tags globally when subtasking directly
But perhaps it makes more sense, at least until there is a better option, to go for the other extreme and perhaps disable this feature entirely?
Note that when creating a task, one can still add any tags that are desired. And it will still become a sub task by default, and notify subscribers of the parent task. Also, resolution of the sub task notifies the parent task as well.