How fine toothed is the electronic aperture blade control in modern lenses?
Are any modern cameras/lenses capable of seamless electronic aperture control?
As in having something similar to a smooth rack from one aperture to another with a de-clicked lens?
In theory it is impossible to make a digital control system with a totally smooth analogue output. This includes setting aperture, either under manual control or by auto metering.
However, as no mechanical system is 100% perfect it seems reasonable to consider that a digital system that has granularity finer than the mechanical accuracy of the aperture blade adjustment may be described as 'smooth'.
This is another example of signal to noise effects.
Whether any camera system attempts to produce a totally smooth control I don't know. I would expect that dedicated video systems would aim to approximate a smooth variation, but even they may work with (say) 0.1 stop increments which would probably be undiscernible to a human observer.
Every photograph is an abstraction from reality.
Most people are more interested in the picture than the image.