Earlier quoted context omitted.
Most accessible users use JAWS on windows. I focus on accessibility a lot for my job. In fact, we have an entire department dedicated to accessibility design, implementation, and testing. The reason why accessible users use JAWS is that it works across the entire OS and all the programs you have installed; start menu, PowerPoint, web browser, control panel, Google, etc. etc. The problem with the native accessibility…
By tools, what do you mean exactly? The only tool you require on the OS-level is a screen reader, and it talks to the native Windows APIs depending on what application you are using. If you are referring to the different accessibility API implementations like MSAA, UIA etc. that is not something that should at all impede a native app of any kind, so what exactly are you referring to here?
The native screen reader built into windows doesn't work well with web pages, so you have to get your own tool (sorry, screen reader) specifically for reading webpages. The browsers all have some extensions for this. So yes, now you have two tools to use - the native screen reader and the browser. And they both are garbage (I've used both while my license for JAWS was pending).