Well, all of us have to make due with what we have available to us. For most of us, screenshots might not be accurate enough in comparison to a movie in motion on a much larger screen than a 43" monitor.
Before this announcement, if Criterion had decided to release this Blu-ray in 1.66 ratio, there wouldn't have been much controversy and that most of us would have applauded them releasing it in widescreen format. Oh well!
As much as I have a problem with Criterion not offering this movie in widescreen format, there is no doubt this disc will look significantly better than that Japanese disc due to the below excerpt from Criterion's site.
New 4K digital restoration, with uncompressed monaural soundtrack on the...
We are all dealing with it, with some of us refusing to buy this Blu-ray. If that upsets you then that's too bad because I have no problem with you buying this Blu-ray. That's your decision, the same for me, it's my decision to not buy this Blu-ray.
Let's remember that Citizen Kane was released by Criterion through an agreement with Warner Home Video. A Star is Born was a Warner Archive release so it's not surprising that it's not being streamed anywhere yet, not even on HBO Max as it seems like WA is trying to protect their WA disc sales.
If it was a Warner Home Video title via Criterion, like Citizen Kane then I can see it on iTunes. However, with this old UA title that is now controlled by Janus Films, I have a feeling it's going to be exclusive to the Criterion Blu-ray and The Criterion Channel.
Their arrogance comes through with their messaging here. Yet, just looking at the film you can plainly see that the framing top to bottom isn't right in 1.37.