I'm not familiar with the ordinances in Dallas, but I think this may not be as much of an apples to apples comparison as you imagine if the thesis of that comparison is that "Houston has no zoning".
You have to find an actual free city to do the comparison.
Anecdotal, but Greater Houston differs from DFW as it's more blue collar and DFW tends to be fairly white collar/corp focused. Ironically, Houston also has much more wealth. So what this means is DFW feels like it IS middle class with some lower, some upper, and a few Mark Cuban's. Houston has a whole neighborhood of Mark Cuban's, you see lower income everywhere, and it's kind of unclear where the middle is. In the exurbs? Is exurb A a middle, upper middle, etc. it's not clear where those lines get drawn. Dallas in particular is more segregated on income (which is correlated with.. you know) with the southern part of town being almost exclusively lower income. Houston is more integrated in this regard, there are pockets of wealthy areas surrounded by lower income areas and the folks interact with each other.
I actually don't hear a ton about the big money buying here in Dallas (Zillow, etc). It's just people that sold their west coast house for $2M+ and move here cash rich. I see a lot of mid-lifers so school district & distance to office is the biggest draw for which areas are seeing the largest price gains.
Dallas itself is competing with it's suburbs, Plano/Frisco etc. The development you see was planned 2+ decades ago and really only a surprise to folks that don't keep up (most people, I know, but I tend to keep up with this stuff and like to buy and hold land ahead of development). Bishop Arts for example has been a 3 decade overnight success, similar story with other areas you mentioned. Many of those areas I felt like they took way longer than they should have to get developed, and it's because all money goes north to the burbs. Uptown is about as far south as most money is willing to go. Design District, Deep Ellum, Cedars are proximity plays after Uptown got kind of expensive.
I don't really do much nightlife stuff. But about 10-15 years ago, Uptown was like the young professional/college kid place to be. Many of those folks moved to the burbs after a certain age. But many stayed. Now the prices are high, it seems like it's more full of those same folks that never married, never had kids, etc and just happen to be 10-15 years older. I think it still has the reputation but realistically, younger crowds (<30 or so) don't seem to spend much time there anymore in favor of Deep Ellum, etc.
Houston does rely on a lot on developers being able to put "deed restrictions" in place, which seems like their free-market/libertarian/state enforced private contracts solution.
I'm not familiar with Japan but their property laws are not unregulated so I think it's worth sussing that out so people can properly back their assertions with arguments and maybe we can derive a defendable % cost impact from zoning laws.
The only areas free of zoning that I know of are slums, shanty towns, and favelas.
It is illegal to build in Houston properties that would be legal in Japan or Europe.
I've looked (links below) and have done more querying than a comment thread like this probably warrants but wasn't able to find your assertion articulated anywhere.
Neither Japan or Houston are unconstrained free-markets without land use control so I'm doing my best to roughly/quickly tease out zonings isolated impact on affordability. Neither locations have 0 laws so they are close to apples to apples and since we're just doing relative comparison I'd rather keep things data driven. Houston has deed restriction but that is a simple free-market/libertarian private contract solution. Does Japan ban deed restrictions? Both japan and houston have historical zones
I've linked these two jstore articles as well as a more digestible video.
https://www.jstor.org/stable/724839 https://www.jstor.org/stable/30238667 https://japanpropertycentral.com/real-estate-faq/building-re... https://www.planetizen.com/news/2021/04/113144-watch-debunki...
Cost of living calculation between Dallas and Houston says costs are roughly 15% different (as apples to apples a city I can identify to isolate zoning effects). So definitely some effect and a good lever to pull (in addition to others I am sure.)
I agree that zoning reform is part of the issue, I think zoning reform combined with other tweaks would go a long way.
I think that multiple issues cause these problem, we have runaway negative feedback loops in multiple areas, the problems has evolved organically over time so I doubt any one factor is enough to resolve the issue (as nice as that would be.)
I'm not making the assertion that zoning is the sole issue so I don't need to defend it but I figured I could take a quick look and bring some numbers into the mix so we have some numerical grounding for conversation and exploring the problem.