> People will just adjust to send you sms or call you instead for important information.
Or they won't and you will be left out of things.
Not even out of malice! Obviously your closest friend and family will adapt and keep you in the loop. Bigger looser groups are more dubious. I'm a member of a book club for example. There are of course the scheduled meets, organised well in advance. But also sometimes someone just feels like hanging and posts a message on a whatsapp group that they will be at this or that location and whoever is free is welcome to join. Schedules don't always permit it, but when it works out it is fun!
Now of course if someone from the group so want to meet with specifically you/me they will remember to send a one-on-one message, but there is a power in the broadcast nature of some of these things for organisation.