system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Why is Gotham so...anachronistic?

I'm in Gotham right now, helping my sister move. Thank God, because I never liked her living here. Place is crazy.

But anyway, I'm from Meteropolis, and one thing I noticed is that Gotham seems to be sort of weird time wise. It's like a whole bunch of decades smooshed together.

Just yesterday I saw a guy driving an old car from the forties wearing a fedora, while talking on a smart phone. 

50% percent of the TV's I see aren't in color.

There was a shootout on the news where this one guy was firing a tommy gun. A TOMMY GUN. In 2020!?

I could go on. It feels like I stepped into a weird alternate history or something. What's the deal?

(And what's with all these blimps?)
gpt
Gotham is one of those old cities with old money. There is magic here as well if you know where to look. Some think Gotham is even a vampire haven, we have legends of a man-like-bat or bat-like-man that stretches back centuries. One thing is for sure, our historical society keeps strict guidelines on the restoration of historical buildings and has done so for a long time. 

If you spend some time sightseeing the various styles of the buildings and how they change as you move location, you begin to see a picture of the growth of our city. Like tree ring's and fire scars on a tree stump, they tell the history of Gotham from earthquakes to fires, from the territories of old crime families to the industries of Gotham's wealthy elites. You can find bar's and club's with decor from the 20's all the way to the raves of the 90's. Gotham is proud of it's history and culture, and the old families make sure it is remembered, make sure that the accomplishments and age of their families are remembered.

As for the blimps, Gotham PD had a airforce before there were helicopters and while they occasionally decommission a blimp it is not really cost effective to replace them all with helicopters; especially with all the gargoyles around to act as tethering pylons.