In the digital age, the norm is that the states of an analog control map to discrete, finitely many recognized inputs.
We cannot really tell whether the world of Trek is digital or analog,
As consumer tech began to look more digital, Star Trek's look and feel started to look more "computerized" and less "mechanical," if I dare use those terms that way. It would be hard to insist on a fully-digital functionality in TOS specifically. This is all if we are talking about "digitial" in the sense of binary electric computer control. As far as the knob on a phaser, whether it is supposed to spin freely or whether it only clicks form one setting to the nest is not clear to me from the impression I get from the show. The prop itself had numbers on it, I think, which would suggest a way to tell the lower settings from the higher ones.
And do all warp drives need dilithium? If there's a dilithium crystal in the shuttle couldn't they use that one when the ones in the Enterprise fail.
Class F is said to operate on "ion power" in TOS "The Menagerie" anyway, perhaps never annihilating any antimatter at all.
Its fuel is limited, so, range and speed are limited. YMMV.
Your mileage may vary? Is that a pun in this use scenario?
Goes back to the original concept that the warp nacelles were power plants. There wasn't a warp reactor. The engine nacelles produced the power.
The Kelvin (if you accept it as existing) apparently actually has it Engine Room in that nacelle. This might support the idea that the entire warp reactor could be in the nacelle, but apparently this approach was not used later on. I like the idea that she shuttles in TOS had a finite ability to travel at warp, without the possibility of somehow cannibalizing them to replace the main engine system. Actually the Kelvin's true secondary hull was basically just a shuttlebay. Perhaps the "antimatter nacelle" or "antimatter pod" (only when used singularly) in TOS is just the warp drive equipment that is in that ship's secondary hull, the secondary hull being at this time, in a sense, a "glorified" nacelle.
This is separate from TNG where the secondary hull is able to function as a complete ship, despite its position being similar to where the Engineering equipment was on Kirk's ship. This might help explain why the Enterprise-D could reconnect itself without a starbase.