It’s a different type of systems engineering, that’s more akin to sorcery, than to actual physics.
The hardware is, of course, limited by physics, like the speed of electrons and heat dissipation. But once you get past that, your computer system is a collection of bytes that you reassemble to form whatever it is your imagination desires.
And while the 747 is a magnificent plane, it did have the benefit of over 50 years of aviation and aeronautical science behind it, all figured out.
Whereas software is still somewhat in its infancy right now. And every few decades, it seems to revolutionize itself, as newer and faster hardware become available.