Yep definitely a fair point. Our assessments are building out full projects (so it's less easy to share answers/ get one person to do one question and another person to do another).
Secondly, we do meet each candidate for a 1-hour virtual call as well just to ensure their skills in person align with those online!
We just know candidates are more comfortable completing assessments in their own environment (which is what they would be doing on the job anyway) so we don't want to dock out points for people who get anxiety for onsite tests.