While I admit I know more about technology than business, I believe that the decision by Particle to discontinue the Xenons (and mesh) will end up being a fatal business mistake.
IoT is a very crowded field with many competitors. A lot of companies are making micros with modems and WiFi. In my view, what differentiated Particle was that they had an “eco system”. By an eco system, I mean an integrated set of hardware components that collect data from sensors AND sends it to the cloud.
I am not saying that Xenons were perfect. I have highlighted in the forum the continued problems I am having (until the present time and with the latest firmwaware) regarding the instability of the Xenons with fast updating UART sensors. However, on Xenons, i2c works and works well.
I have been running 2 outdoor systems with Borons and 3 Xenons each now for over a year (24/7) and it has been working well. With the discontinuation of the Xenons, I am just not sure of any compelling reason to continue using Particle products.