I am a paid Todoist user and I find this feature useful and interesting since I sometimes procrastinate tasks without notice. I will still need to test the accuracy and whether the auto allocation is reasonable. Overall, it's a right direction for Todoist.
The no brainer for those who procrastinate a lot on a daily basis.
It's working the same as Google Calendar that it can arrange some activities in your free time. It's interesting in the beginning but never use it anymore since I can arrange my own free time without the help of it.