Why none of high-end speakers offer Speakon?

Is it that bad? Yes. Most pro gear is designed to stand abuse first and foremost; sound is a lesser consideration. I guarantee that GOOD recording studios DO NOT use cheap high powered amps. Check out some of the forums run by serious recording engineers. My REL subs use Speakon; there is nothing wrong with them. It is a chicken and egg thing; neither the cable manufactures nor the equipment makers will start using them until the other goes first and at present there is no demand that either do so. Remember that universal compatibility is much more important in pro gear than home and locking connectors are better in a situation where the equipment may have multiple users. There are crossover products that are used by both home and recording/broadcast studios. GamuT was a pro audio company, ATC and B&W are used in recording studios, Spendor in broadcast ones; Berry Diament uses Maggies as monitors; Tony Faulkner uses Quads. Also remember how bad a lot of records sound; guess what was used to make them. Garbage in, garbage out; pro or home, good equipment is seldom cheap; can you overpay, sure. Do some serious research before you buy and listen as much as you can; then buy what makes you happy whatever it was designed for.

For my Vapor Audio speakers I use custom made (gold plate over copper) Speakon connectors to handle the connection from external crossover section to woofer/tweeter. Still standard WBT binding posts for amp hookup though. Speakons are a great design though, and I like the minimal conductive material idea, like Eichmanns.

I doubt you'll see any home audio speakers use them for amp hookup simply because nobody makes wire terminated with Speakons.

Genesis has used Speakon connectors with their bass amps/speakers but that's a pair for 2 channels and 2 accelerometers per side. I like them and have used them for other projects, including liquid level and 24V controls(Neutrik PowerCon is approved for 120V and has similar appearance). Perfect fit for 14/3 SOW and no soldering required.

To get 2000 watts out of a standard 15A outlet would require over 100% efficiency. I call "shenanigans"! For milliseconds?... How long would you need 2000W?

As far as "looks and hype", join the crowd.

Bryston is the brand often used in ther recording studios for monitorring amplification and recording demos.
2...4000 WPC isn't necessary in studios at all. Among the pro power monsters I would say that lower-powered Crown XLS series are descent performers.
The pro-grade preamps do reach the price point of $8k+ due to the number of important features suitable for pro audio.
As to Speakon I too believe that it's the best way to connect/terminate speaker cables.

I have a pair of the weirdest speakers when it comes to connections. For the connection from the amp to the speaker, it only has a terminal strip (remember those things that had tiny screws?). Fortunately, the crossover is contained in three external boxes, so I could just add binding posts. The connection from one of the boxes to the woofer portion of the speaker uses a speakon connector.