There may be times when you want to prevent a failing test from causing the whole build to fail so you put failing tests into quarantine.
You have the assumption that when you have time, you’ll fix up those failing tests. Or someone else will do it.
The reality shows a different picture.
Why are tests quarantined?
Tests can end up in quarantine when it is thought to be flaky for example, or a part of the component is being rewritten which is still in progress so that tests would fail, yet the code has to be merged in, etc.