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

There was a recent question about the percentage of importance of components.
It seems obvious to me that speakers and cartridges are. Are there other transducers?
IME, upgrading my speakers and cartridge were, by far, the greatest improvements.
(feel I must also mention the great improvement from Townshend Podiums as huge, not to digress)