As a rule of thumb, when the Tories Demand that Labour do X or Y, the best plan is always Z.I understand the logic of why they aren't.
Labour know they're going to win the next election anyway if they stay on this course. They are trying to appeal to both the remain voting metropolitan liberals and the leave voting working classes simultaneously. Being too outspoken on policy risks alienating one or the other.
It's a sensible tactic though thoroughly uninspiring. Also it gives less options for the Tories and right wing media to weaponise against them.