It's too limited. We can only test a delay or test emails. We should be able to "Copy to group" also. So that we can split test our email and campaign strategies. The "split groups" function doesn't work for this use case because that function only applies on a single campaign level. Sometimes subscribers need to retain that A or B group for a lifetime to use in automations, campaigns etc. "Split groups" is also not dynamic. We need new subs to be A and B grouped.