Not sure if the tests will be built into the fCC site in such a way that you can't complete a challenge without all the test passing. I think you will still be able to complete the projects without the tests, but they would officially (if you want to do non-profit work) be considered failing.
In my opinion, building things is way more important than passing some arbitrary tests. So, if you feel like the tests help you structure your project, use them. But if you feel restricted by them, I would ignore them for now.
I hope that all of them get fixed, or else removed. The new curriculum is still in beta without a real deadline (as far as I know), so I think most of the bugs/annoyances will be fixed/removed before it is released.