[Newer high-end airplanes](https://www.youtube.com/watch?v=qlR0mszVIng) do have automated start sequences. Technically it isn’t too difficult, it’s just that it requires a computerized sequencer to operate all the switches and valves based on inputs from other instruments. When you have critical equipment run by a computer you have to go through a painful, long, expensive process to qualify the software and hardware.
I work in nuclear. Software QA is similar — usually easier to deal with ancient instrumentation than find something with acceptable software QA.
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