Fixed terrestrial wireless is indeed a substitute to cable and DSL (especially DSL)
Both business and consumer services are typically more expensive by 10-100% and have installation (particularly LOS) requirements many -- if not most, in topographically unfavorable areas -- cannot meet. While the business services are usually OK once installed, consumer services are particularly unstable and the equipment prone to early death.
Notably, the wireless ISPs I'm familiar with ended up either shut down or moving to a different line of primary business as soon as any sort of viable wired service made it into town.
While far better than relying on mobile data if you don't have other options, it's still definitely not a substitute, even for DSL.
If you're very, very lucky, the hardware might have been manufactured to run optimally on those frequencies, or it might just be a WAP in a different box running tweaked software.
This has the generally-crappy results you would expect.
Business gear is substantially more robust and expensive.