Should “Fairfax County” become a city?

Should Fairfax County become a proper city?  It has over a million people, many more than Washington, D.C.  The bottom line seems to be this:

The basis for the idea is largely tactical — under state law, cities
have more taxing power and greater control over roads than counties do
— and it led to more than a few snickers about the thrilling nightlife
in downtown Fairfax (punch line: there isn't any).

Natasha could no longer say "We are from Washington":

If Fairfax does become a city, it would instantly become one of the largest in the nation, the size of San Antonio or San Jose.

It would also diverge dramatically from the stereotype of the gritty
metropolis. Fairfax enjoys many of the benefits — wealth and jobs —
and few of the detriments — crime, troubled schools — of a large
urban center. With a median household income of $105,000, it is the
wealthiest large county in the nation. Among large school systems, it
boasts the highest test scores. And it has the lowest murder rate among
the nation's 30 largest cities and counties.

One question is why this rather uncoordinated mix works so well.  Federal dollars, diversity of immigration, and diversity of planning strategies all can be cited.  The latter factor probably means we should not touch the status quo.  And by the way, almost all of our nightlife is Korean but it does exist.