The choice is to use Slack or not. It's their service to offer how they wish, and your choice to use it or not. Tesla doesn't have to make a manual transmission

The choice is to use Slack or not. It's their service to offer how they wish, and your choice to use it or not. Tesla doesn't have to make a manual transmission (equivalent) car just because I'd rather drive stick, but I just won't drive a Tesla then.