I too tried the array microphone built into my laptop and yes, it does work with Dragon. However, when I compared it to my Sennheiser D10 USB over the ear Wireless Microphone, then you notice the differences.

When using the array, I found it had difficulty picking up the small words such as,
a, an, as, at, in, I'm, I've, I'll, on, if, end for example.

I also found that unless it was as you say, a very quiet and still room, even having a fan on in the background away from the computer affects a microphone such as an array.

Cheers

Tiger Feet

| DPG 15.7.1 | KnowBrainer 2020 | Windows 10 Professional /64 Bit | Intel® Core™ i9 Ten-Core Processor i9-10900K (3.7GHz) 20MB Cache |  32GB RAM. | 250GB SAMSUNG 970 EVO PLUS M.2, PCIe NVMe SSD (up to 3500MB/R, 2300MB/W) Boot Drive | 1TB SAMSUNG 970 EVO PLUS M.2, PCIe NVMe SSD (up to 3500MB/R, 3300MB/W) Storage Drive | Sennheiser D10 USB Wireless Microphone