I certainly don't like it as an immediate reaction. But I guess, especially since it is a "new feature" I'll try and think about pros and cons.
Pro: I'm not there yet! Can't think of any since signing up for all tables in the stake was previously an option.
Con: No more easy table selection prior to sitting down. I can't easily choose which table I'm joining.It would take a bit of finessing to table select. I'd need to note the names of all the tables in my stake that I want to join, then join all the tables' waitlists, and then accept only the open tables for what I want.
Anyone else?