Thank you for your questions. The IEEE802.11ax standard was ratified late in 2019 and Ruckus were the first vendor with a certified Wi-Fi 6 Access Point (Ruckus R750), so we are at the front of the line with the latest and greatest Wi-Fi products!
1) Outdoor APs are more complex and costly to design and produce as well as having lesser market demand, so these tend to be released after the equivalent indoor AP models. Ruckus will be releasing a Wi-Fi 6 certified outdoor-grade access point in 2020. We don't have an exact date as yet but please keep an eye on our website for details: https://www.ruckuswireless.com/products/access-points
2) Ruckus APs have a built in unique active antenna array, called BeamFlex+, which facilitates multiple technologies and benefits, especially in challenging RF environments. If standard antennas are fitted to a Ruckus AP then the benefits of BeamFlex+ will be lost. More details here: https://www.ruckuswireless.com/rucktionary/beamflexhttps://purdi.com/vendors/ruckus-wireless/ruckus-wireless-beamflex-explained/https://www.youtube.com/watch?v=0G7CfExG1oE
If you require further details, I would recommend you contact your local Ruckus Networks partner: https://www.ruckuswireless.com/partners/finder
I hope the above information is useful.