A guitar tone circuit is just about the simplest LCR circuit. In LCR circuits the only measurable things that count are inductance, capacitance, and resistance. None of those other things count when calculating the response curves. The calculated response curves follow the measured response curves to more places than I can reasonably type.
Unfortunately if you can't measure it - it isn't real. I'd LOVE for mojo to be a real thing. But it isn't.
Here's the question if you're trying to sort out real truth from a sales pitch or determining if something is true or false in the real world. It's simple - can the thing that you are stating be objectively measured? That is all. Period. Full stop. The end. If it cannot be measured it's just BS ie. mojo. Mojo may make you happy (and that's fine!!) but it's not actually REAL in the real world. It's just in your head. Dozens of double blind tests in audio have found this to be true. Over and over again.
Pickups? Different magnets have totally different magnetic fluxes and permissivity. This is measurable. Different numbers of windings (you can have the same dc resistance with diff windings of diff wire gauges) and the winding pattern dramatically effect inductance and capacitance. This is measurable. Coil size and spacing have dramatic effect on how the string is magnetized and the coils are activated by the magnetic flux. This is measurable. These *measurable and objective* differences explain why different pickups sound different.
Speakers have about a gaziliion *MEASURABLE AND OBJECTIVE* parameters that effect sound transmission other than just size. Magnetic flux (measurable), free air resonance (measurable), permissivity (measurable), cone torsional strength (measurable), cone reflectivity (measurable) . . . I can go on and on. All of these are *objectively measurable*.
The human ear is the absolute worst tool for objective testing. It has been shown time and time again that differences between wires/capacitors/power cables/mojo component du jour that were "completely obvious" in previous testing were completely indistinguishable when tested in a double blind environment. And if if can't be heard in double blind testing and objectively measured then it is simply not real.
Capacitors in millivolt level guitar circuits fail the test of objective measurability. Two non-defective capacitors with the precise same capacitance will be indistinguishable because there is no measurable difference between them that can possibly have any effect audio in the human hearing range or anywhere near it. You don't get skin effects and inductance effects from capacitor construction at these sizes until you are WAAAAAAY up into the 500KHz range. This is objectively measurable. Period. Full stop. End of story.
Anyone that tells you different is trying to sell you something.
Yes, different types of capacitors measure differently when holding their capacitance constant. Look at the datasheets. Why do you think different types of capacitors exist?
It seems pretty out of touch given your experience at 5ghz to not know that capacitors of differing electrical properties, measurable, are available.
If it’s in the circuit, it counts...it matters. You saying only this or that matters is your opinion. If you really care what’s happening you need to take an inventory of every element.
It hasn’t been demonstrated to me that these differences are inaudible as you suggest. So, I use what sounds best. This has nothing to do with mojo, hype, etc.