The atypical part is only that this is an all new one - suburbs have existed for more than 100 years now, so there are a lot of older houses in the suburbs, many of them don't have 200 amp service (though the owners are upgrading them as they as things like AC that need more power and were not considered in the original design)
Sure, there are suburbs that have existed for a long time and are still going strong. And a lot of 100 year old suburbs that became financially unviable and are now empty or torn down.
But large chunks of some of the largest metro areas are made up of massive suburbs largely built from the 2000s onwards. I'm talking Houston, Phoenix, DFW, Austin, Atlanta, Denver, San Antonio, Kansas City, Oklahoma City, Tucson, Knoxville, and similar areas. And that's just areas I've visited.
Sure, there are 100+ year old neighborhoods in Dallas. But around me, some homes were made in the 50s, a big spurt were made in the late 70s and early 80s, then a massive amount were built in the 00's to literally still being constructed. Massive neighborhoods, apartment complexes, shopping centers, and more exist where there was farmland just five years ago. This makes up a large percentage of the growth of this city. It's not like they're building 100 year old houses for the 30% of growth over the last 25 years.
Go take a look at satellite images of Prosper TX. Of Princeton TX. McKinney TX. Allen TX. Rockwall TX. Dickinson TX.
Where I grew up in Houston in the late 80s/early 90s, you practically couldn't find a house that was built before 1975 other than the derelict remains of old farm houses. The house I grew up in was built in '93 and was kind of out there at the time (had to take a dirt road to get to the neighborhood!) And there's been a ton of construction since then, going further and further into the swamps. Woods where I grew up playing in are now full of single family homes.
So no, the sprawl of suburbs continuously marching more and more into the country side isn't a new thing and it isn't something rare in the slightest. It's happening practically everywhere that's growing in the US and has been for 30+ years.
