Yes, the reason for including a time limit is clear; it's just not an ideal aspect of the tests. Even if it's not the primary issue, it's influenced by human nature.
| Perhaps it's used to filter out people or programs that randomly click? |
I think it's also because, in tests with rewards for quick completion, completing all the simple tasks and skipping the rest can sometimes lead to a higher or equal score compared to someone who solved many more tasks, even if they took more time. That's why the reward was removed, but the time limit was kept.