again, just an oppinion, but it feels really weird to hear you find "exception after exception", when the net result that you've ruled out more real world robotics projects on ARM than likely exist on x86 that you're suggesting should be the "norm".

you've ruled out the entire NXP ecosystem, the entire Nvidia Jetson ecosystem, the entire AMD/FPGA/Zynq ecosystem, even perfectly good options like beagle-board .... who else?

incidentally, you've also ruled out this project - as they are using an M7 microcontroller...