First, whether it is necessary or not depends mainly on your job content. If you have a lot of modeling or calculation, you may really be inseparable.

Second, if you can use it, I don't think you will buy a genuine license yourself, so it depends on whether the unit has a genuine license. However, most domestic enterprises may not buy this software. Then theoretically, you can secretly use it yourself, but you can't use it in formal occasions such as publishing papers because there is no authorization. The publishing house should not accept the manuscript. If it is published, it may sue the unit.