Aren’t the two main transducers, speakers and cartridge, the most important?

Regarding transducers: surely I was impressed by the difference between my $3K cartridge and my new $13K one. However, it also made clear the importance and central contribution of the cartridge.
The role of the two transducers, cartridge and speaker, clearly are foremost in a system. The cart taking a tiny vibration and translating it into an electronic signal. And a speaker taking that electronic signal and turning it into sound. Surely, the up line/down line components all greatly contribute. But we would have nothing without the physical/electrical-electrical/physical process of the transducers. To describe from a lay and outline description.

Looks like  someone got "schooled."

Maybe a trip to the wood shed.  :-)

Only speakers can change the radiation pattern of sound.

For those of us that enjoy something other than usual box speakers e.g. open baffle, omni, dipole, bipole, wide dispersion, this can only be created by the right speaker.