My nationality never had an issue in obtaining a Work Visa (not that I have heard of anyway). 99% no documents are missing and the application is done correctly.

Finally, do these two rules apply?
Business Visa rejected: 3 months before re-applying again with any other company (Immigration don't give reason about the rejection)
Work Visa rejected: 6 months before re-applying again with any other company (Immigration give reason about the rejection upon manual submittal of the documents and meeting for reverting the initial decision)