As SemlerPDX mentioned, the built-in speech recognition for Windows is being deprecated - that means that they are no longer going to be developing anything new for that feature going forward. To be straight up, I don't believe anything has actually been done for those features in probably several years anyway. Since the built-in speech engines are 'fine' as they are and do everything that they need to do for VoiceAttack's voice features, I don't believe that to be problematic (although updates are always really nice).
There is no mention of removal of the built-in speech services at this time, which is great for the folks that continue to use the built-in speech engines. That said, if Microsoft decided to suddenly abandon everyone and completely pull the built-in speech engines, the installable speech engines will always be available for VoiceAttack users (
https://voiceattack.com/alternate). I don't get the feeling that Microsoft is going to do this, as System.Speech is still very much available in .NET 8 (current, long-term support framework).
On a side note, I do have roadmap items in the coming months to integrate some form(s) of online voice recognition into VA, starting with dictation services, and maybe some AI fun to boot. I've dragged my feet over the last few years in regards to integrating online/server speech recognition as I have found it relatively slow compared to the local installed speech engines (by relatively, I mean excruciatingly). However, offering an online alternative will allow for additional functionality, with the hope of speed increasing over time.
Hope that answers your question!