The idea that Warren wouldn't be equally as useless with a Republican controlled senate is amusing. It's going to come down to who can energize their voters to flip the Senate in 2022 and who will use the power of executive order the most aggressively, and that's Sanders.
Sanders can't even beat Biden in a primary and you think he's gonna flip the Senate? I don't see that at all.
As for executive orders, I don't WANT a president who just governs by executive order. Executive orders are easy to erase, and the second a Republican takes power they'll just undo all of them. What's the point of a presidency that produces two, maybe three years of good and then it all gets torn the hell away?