To name a few benefits:

• It is quick and easy to set up.  It could happen the next day – if you have your mediation agreement on hand and the parties are available,
• It’s cheaper: as there is no need to hire rooms or incur costs and time travelling. it may be easier for parents – though finding a quiet space may be trickier,
• Mediation can easily be held over more than one day, which is sometimes more convenient and occasionally what the parties need,
• It can be more flexible.  An employee who does not want to meet the employer can remain in a separate room with no risk of bumping into the employer – or attend with no video, 
• It is as easy to arrange 1-1 ‘meetings’ between the parties (with the mediator in the room).  Breakout rooms are useful, though not essential,
• The mediator can have an online pre-meeting with a party very easily,
• Mediation can be more informal.  There is less ‘dressing up’ and we are all sitting at home, with the same issues of uncertain internet, barking dogs, children interrupting, the delivery arriving.   Everyone understands  the ‘new normal’ and we can share experiences. It may be a leveller.