Flying, in general, was a luxury thing. The Hindenburg was super-luxury, the equivalent of one of those private rooms on an A380 that cost something crazy like $20,000 for one flight.

A bit more akin to the Concorde, rather, with $400 tickets (~$9,000 today). It was all first class, but less so for luxury and more so because it was the fastest way to travel long distances, since planes had to stop frequently.

Only one company ever successfully operated them, and even then, barely kept going.

Goodyear operated nonrigid airships just fine, as did the U.S. Navy, amounting to hundreds of them—but if you mean just rigid airships, yes, Zeppelin was the only outfit with the expertise to do so.

The UK built a couple passenger airships, bht they both crashed.

The R101 crashed, the R100 did not. That ship had failed its flight trials spectacularly due to various extremely lethal manufacturing defects and design flaws, but was given special dispensation to attempt an experimental flight to India anyway, for political reasons.

Also in the 1930s, airplanes started getting much much better and more reliable. Seeing the biggest and best airship literally go up in flames on camera, was the last nail in the coffin for an already-dying machine.

Actually, airplanes weren’t even close to directly competing with airships on the same routes by the 1930s, it wasn’t competition that strangled Zeppelin before they could get a real foothold. That was mostly down to the Treaty of Versailles, which was particularly punishing to them, as well as the combination of helium unavailability, the Great Depression, and the Third Reich’s takeover.

Airships are cool, but airplanes are functionally better in every way.

Not every way. Modern airships have higher endurance, as well as useful niches in VTOL heavy lift, military surveillance, and passenger ferry applications, and they are far easier to convert to electric propulsion than airplanes. They need much less power to operate, and are much more energy-efficient as a result. That efficiency may become much more relevant in the near future, due to the gas crisis.

It takes only 12,000 horsepower to get a 500-ton airship to a top speed of 100 knots, for example. It takes the rough equivalent of 300,000 horsepower (in the form of thrust) to get a similarly-massed A380 up to speed, or about 30 times the power in exchange for 5 times the speed.

And as far as cupolas, while it was thought that tall buildings could possibly be used as docking masts, it was never actually done. The Empire State Building's owners considered it, but the winds up there are too unpredictable, and I dont think it was ever even tried.

It was done very briefly, exactly once, and never again. Skyscrapers are not designed for aerodynamics, their slab-sides cause a pile-up of enormous, unpredictable, invisible wind vortexes. It was much easier and safer for everyone involved to simply land airships on the ground or water.