It's because it's not a wheelchair, so it doesn't need to meet the regulatory standards, nor does the insurance middleman pricing kick in.
Not to mention electrical power (Vs. gas in the competition) definitely could result in the user being stranded, even if it has a power-usage monitor (given how environmental factors can impact non-air conditioned batteries).
But then again I don’t want to exclude the population who are capable of doing this independently.
This really looks like something that can be improved relatively easily. Instead of disconnecting, the pole could slide along the bar when released and click back when raised again. In other words, it's either an early implementation issue, or a cost saving trick, not a spec problem.
Edit: Actually I checked again and Outrider has a semi-off-road vehicle for $5k now which is pretty cool.