tar.zstd is superior in basically every way, open, and portable

It's fine that we run in different circles, but I have yet to see one of these in the wild.

Betamax was better, too.

Betamax wasn't better. This is just a meme.

Half the internet is tar.xz. tar.zstd will probably replace that.

Betamax was objectively better in many categories; that it doesn't fit your narrative is now another one.

It was smaller, had better picture AND audio quality, and a better head to tape ratio.

It was also proprietary and stored less, which were 2 causes of it losing to VHS.

.zstd may END UP being a standard, or it may not, but sheer technical merit is not enough to guarantee it.

Betamax, as released, was not better than VHS. It also had very low recording times of like 1 hour per tape.

Betamax was updated repeatedly, as was VHS. At no point was contemporaneous consumer Betamax able to match VHS for quality with the same recording times.

This is a persistent myth propagated primarily by people who have probably never seen Betamax in use.

Often people compare a professional version of betamax to consumer versions of VHS as well.