I hate to say that this is nonsense and a touch of wine snobbery, and I'm a "wine drinker". As daily drivers and post work glugs there are plenty of decent bagged wines (or rather boxes). I've had plenty from pals who've brought these things back from French supermarkets to Scotland, which are super cheap and decent quality for the money.
It all depends on the wine you want to drink in the moment. As my brother once pointed out when our mother passed away, there's drinking whisky and funeral whisky.
I think you're in more agreement with GP than you realise - as I read it they're saying it's a good system, but we (collectively/on average/'Big Wine') don't want it to change, so box wine is mostly at the low end.
Naked (vintner in the UK, and I think recentlyish launched in the US too) has started doing some boxes though, so some of the more popular (and again, cheaper, but it's a higher starting point than a supermarket) stuff they sell is starting to be available boxed instead of bottles.
I think Naked actually does all the bottling itself in the UK, so if it's popular it'll probably be quite easy for them to expand (i.e. bag and box more instead of bottling it) maybe just needing agreement from the vineyard.
I would have quite mixed feelings about it becoming standard though, even if I know it's better on paper.
I think that could be true for for averages, but I usually don’t drink randomly selected wines. I pick wines I am familiar with and like. I think that I can find more wines I like at 20
Most of us aren't sommeliers though. In a blind test the best I could do would be to say "I like that one, don't like this other one etc". And I feel I know a reasonable bit about reds and have done plenty of tastings over the years. I usually go for the best bang for the buck, and at the moment there's a bunch of great South American wines priced at around GBP5.50-7.00 that are great daily drivers.
So if you are looking for something nice and reasonable I cannot recommend enough going to Trader Joes and just trying every bottle under $12. There are some pretty dang good ones.
We tried all the various boxes and found ones we like (bota maybe - the wife buys it), mainly white wines. They seem to keep in the refrigerator fine for a couple of weeks.
Haven't really found a box/bag red that I like enough to keep buying. Instead I keep a bottle of some sort of red on hand so I can have a 1/2 glass with whatever food I cook that night.
Additionally, I order cases of more unique wines from b21 and keep it on hand for special occasions.
Sadly I didn't keep any notes on the producers or grapes. I trust my pals not to bring back cheek puckering bags of vinegar :) Also these are 10 litre duty-free boxes which the equivalents would be eye wateringly expensive in the UK due to the tax our government slaps on wine. So I have to wait until their next trip (who knows when?) for another lot.
It all depends on the wine you want to drink in the moment. As my brother once pointed out when our mother passed away, there's drinking whisky and funeral whisky.