I want to make a next version of my current project. I’m hoping to use an Arduino compatible processor that also supports at least 2 processes simultaneously without using pro threading or any other software workaround. The more commonly used the processor is, the better the user support will be if something goes wrong.
You may also be interested in the Teensy 4.0. It is single-threaded (one CPU core), but it executes two instructions at a time if possible and runs at 600 MHz.
Beyond that, I only know of the ESP32 as well, for genuinely having two threads. Beware, if you want to design a product using that there might be extra hurdles with the FCC/whatever your country has since it is a radio emitter. Using an ESP32 module might simplify things, but I have very little idea how the legalities work.
It also seems a little wasteful to use a processor with Bluetooth and WiFi capabilities just because you need two threads, but it may be the only option.