I have had no problems with 0.9.3. On the plus side my OAK TFT now works. As noted, any WIFI sketches no longer use ESP8266WiFiMulti to set up the configuration with credentials.
I do feel that having the ability to re-flash the firmware is still a requirement. I have a complex sketch that starts to run, but then throws a continuous fatal exception. I'm not sure if there is any other recourse, but I simply re-flash the firmware and reconfigure. On the plus side, the re-flashing / reconfig process is very straight forward and has worked reliably for me.
One suspicion that I have not verified: I'm not sure if serial programming via the Arduino IDE works under 0.9.3. I was able to do this before, but now, it appears to me to go through the process, but the firmware is not flashed. Perhaps something changed? Take this with a grain of salt because I have not spent the time to verify.
Good luck!