I’m not replacing the Teensy with the ESP32, just adding another option for people to use. If a Teensy 4.0 comes out and it’s reasonably easy to port SmartMatrix Library to it, I probably will.
The Teensyduino Arduino integration and Arduino libraries are much more robust than the ESP32’s, as far as I can tell from my limited use. The ESP32 SD library doesn’t conform to the Arduino SD library, and it’s not nearly as straightforward to allocate memory on the ESP32 and see how much is used by a sketch and is still free for use vs the Teensy.
ESP32 supposedly has much better bandwidth than ESP8266.
VS