In any war, there will be counter-attacks that muddle things up and make it hard to perceive who is on offense or defense. But if we look at Bernie Sanders/Elizabeth Warren/Andrew Yang, for instance, their proposals are a clear case of offense: Big proposed changes to the status quo. Universal basic income, single-payer healthcare, student loan debt forgiveness, probably a huge overhaul of the tax system, much greater focus on tackling climate change, etc.
“Offense” doesn’t necessarily mean “bad” (I think that’s what some people in this thread are confusing/conflating; they think offense means one side is doing wrong.) Indeed, I’d argue that many of the Bernie/Warren proposals are just what is needed. But they are indeed a big, aggressive step forward for the liberal-progressive cause, most definitely not status quo.