A fixed wireless ISP can be as fast and stable as a fiber connection or as slow as a 90s-era DSL ISP. The main problem is scaling - as you add customers, you have more users competing for a limited spectrum. To accommodate this, you have to use TDMA and other multiplexing strategies which reduce throughput and increase latency.

It's been a long time since I had to use satellite, but I'd happily take even the most oversubscribed WISP out there over satellite internet.

Depends on the wireless ISP. Speaking generally, a wireless ISP has the potential to provide much better service at a much lower price. As compared to current satellite internet providers it is exponentially better, as compared to Starlink... who knows, we'll see when they release concrete information.