Having answered a huge amount of feedback over the years, the release of this update fills me with great joy - I know from now on I will no longer have to tell people that you can't make a task private to just one user!
So from today you can make tasks private to individual users regardless of the company they are in. Gone is the "only private to the owner company" option. Now you are free to pick and choose who can see what within a project.
Working with multiple departments or even outsourced companies? No problem. You can keep tasks private between you and one, or indeed, a handful, of them.
These screenshot show the new Lockdown feature. You can find it in the privacy tab when creating tasks. This gives you the power and freedom to specify exactly who can see the task.
It really is a thing of beauty!