In focus it would be helpful to have the opportunity to mark the activity as complete as it only works if you have the breakdown sub tasks and when they are all completed it comes up to complete activity.
Otherwise you have to change to the schedule find the activity and then mark as completed.
After the upgrade only the sub tasks are available to tick and when completed you have to find the appropriate activity and then tick it. Not simple!
So even more reason to add the activity completed option to the focus screen so you can decide whether you need to end the whole activity before the timer finishes.