Glad to see this thread come up. Interestingly, my ancestral hometown of Johnstown, PA had one of these developments (the original Westmont shopping center) decades before the current trend of insta-downtowns sprang up.
I’m definitely divided over these things. The first, and so far only, one of the new type I’ve seen is Market Street, in The Woodlands, TX, which started up about two years ago. I sort of figured there must be others. I get the OP’s complaint, but I can’t totally condemn what the developers have accomplished: something resembling a downtown in a place where there formerly was none, actually a pretty good caricature of 1920s-'30s urban architecture, and for me a far more attractive and pleasant walking and shopping environment (IMO) than yer typical enclosed mall or strip center.
Now, most of the shops in the joint are national chains hawking upscale merchandise that leaves me cold, but there are a Borders and a Smith and Hawken more or less next to each other at one end, and a pretty good movie theatre, so I spend my share of time and money there.
Admittedly, Market Street looks even more artificial than the town set of the Back to the Future movies, but it seems reasonably well-built and has numerous interesting architectural details that I think will hold up well over time. I will admit to being a bit amused by the developer spending lavish amounts to construct this Potemkin village, when only about ten miles north there is the moribund downtown of Conroe, which has practically the same layout, overall size and architectural style as Market Street, and actually does date from the '20s-30s, yet slumbers away ignored. There is, of course, a larger and more affluent population to snare at the Woodlands location.
It will be most interesting to see what happens with environments like Market Street about 20-25 years down the road. Will they abandon it to private owners, continue the increasingly heavy maintenance as the buildings age, or just tear the whole thing down and start over? The Westmont center I mentioned at the beginning of my post may be a model: limited road access has more or less pinched it off, and while the buildings have not deteriorated into slums, there are no major shops other than a pharmacy and Dollar store left in it, and one could roll a bowling ball down the middle of the street without hitting anything. That could be Market Street’s fate a few decades on, and would that really be desirable?