I used to ride with my brother until his hip gave out. Since then, I've mostly been riding alone. My brother recently had hip surgery and hopefully, we'll get back to riding together again in the near future.
I've found that, for me anyway, cycling is really a solitary sport since it's often difficult to converse. Riding two abreast is not safe or even possible on the trails I ride. Brother and I used to use walkie talkies which helped somewhat but requires riding one handed and the conversation is simplex. My wife and I have Sena helmets which are great, but she isn't up to riding much anymore. My brother doesn't wear a helmet so we can't use that method. I'm now looking at Sena Bikom devices which can be clipped to a hat. If we ever get back to riding together, that may be a possibility. I see some riders using cell phones with headsets to communicate. I suppose a conference call could be used in a group but this requires a cell signal which isn't present in 75% of the places I ride. Realistically though, it's unlikely everyone in a group will be able to use the same communication method.
Other issues with riding in a group, or with another person, are pace, direction and frequency of stopping. Everyone seems to have their own idea on what these should be. Keeping pace with another e-bike rider can be problematic due to different PAS systems and individual ability. Planning a ride in advance or having a "leader" can help with these issues but not everyone knows their ability. Breakdowns are another factor. How will a single disabled bike affect the group?
Professionally organized tours offer the best approach for group riding, since the pace and itinerary are published in advance. Many have SAG wagons or Trailmasters who follow the group and deal with stragglers.
Having ridden with groups, and other individuals over the course of many years, I now find I prefer to ride mostly alone. For safety, I use a Garmin Inreach satellite communicator, cell phone, Uber, Lyft and AAA for emergencies.
Just my 2 cents though, so YMMV.