Who is ordering their tesla semi truck

In terms of practicality, it is hard to argue with your statement. At least for now and the near future.
However, let's not delude ourselves. Electric engines are better from the very engineering concept. Cleaner, less complex, more efficient with the energy input to be converted into kinetics.

"Electric motors convert over 85 percent of electrical energy into mechanical energy, or motion, compared to less than 40 percent for a gas combustion engine."
Electric Vehicles 101.

The question remains about the battery technology. Had that effort not been thwarted by oil business over 100 years ago, internal combustion engine would have shared the fate of the steam engine long time ago.
Internal Combustion: How Corporations... book by Edwin Black

 

Not everyone gets in a truck every day and bangs out 700 miles. Long haul isn’t going to be practical for electric trucks for a while, but given the companies using LNG and CNG it stands to reason that electric would make inroads in local markets first. There are many operations that could see benefits of electric trucks. It will be the same way with autonomous operations. Leave here, go there, and return back to here will be the first types of operations to go driverless.

 

If you liked it so much why only 4 years ??

 

Although with the current fuel prices $50 sounds like quite an attractive daily expense.

 

If they ever figure out how to produce energy from fusion that will be the end of internal combustion engines. At that point it's just a matter of upgrading the infrastructure everywhere.

 

"Just."

 

Well that's not going to happen overnight of course but reliable, cheap fusion energy will spell the end of relying on fossil fuels for our energy needs. Maybe 10 years if infrastructure is quickly upgraded or 20 on the slow side?

 

Yeah, my impression of Tesla/ Electric car owners…

 

The amount of powerline and transformers that would take would put it at 20 years is my bet.