Following up on https://github.com/spring-projects/spring-framework/issues/35254#issuecomment-3212944107, there is a need to clarify the semantics of taskTerminationTimeout on SimpleAsyncTaskExecutor/Scheduler - and potentially to make the time of interruption configurable, similar to waitForTasksToCompleteOnShutdown on ThreadPoolTaskExecutor/Scheduler.
However, the common scenario is not quite analogous since loosely executing individual Threads are not being stopped as part of lifecycle management: With SimpleAsyncTaskExecutor as well as SimpleAsyncTaskScheduler, the only stopping of such loose tasks happens on close(), so it seems sensible to leave some room for them to complete based on their own lifecycle management (as of 6.2.10). For scenarios where immediate interruption is nevertheless desirable, we could provide a configuration flag, effectively opting into pre-6.2.10 behavior.