Clearly the campaign made a decision to never answer this question, no matter how awkward. Why would that be?

They want to do it but keep it secret? Doesn't square with me, because... https://twitter.com/mckaycoppins/status/1314026314899259394

...If you don't want to say it, you know it's very unpopular. If it's very unpopular, it's probably going to be hard to do.

More likely reasons are:

1. Many Ds want to do it, while some, along with swing voters, are squeamish. Why take a firm stand on a divisive issue now?...

2. Having the *threat* of court packing in your back pocket is useful leverage to enlist the bipartisan cooperation that, as Biden said emphatically yesterday, he's determined to restore. Why give up that leverage?...

As Biden said back in 2006 (when talking about Corn Pop!) "You gotta be prepared to use the chain, but there's other ways to do it." https://twitter.com/billscher/status/1313667671083413504

I don't discount the possibility Biden may yet do it if his hand is forced. I just don't take the current non-answers as proof Biden has secretly flipped on his, fairly recent, stated opposition. There are more plausible explanations.