Same as appendix it once was very useful now it can do some good under very specific circumstances.
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For boards without IO, FMU needs more pins (special model MUC model). There are no more disadvantages, at least CUAV x7 has done a successful demonstration.
More manufacturers continued the old design of pixhawk, CUAV X7 removed IO, successfully verified that IO is not necessary (no IO board, almost Servos supports Dshot)
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