C7000-100NAS Slower WiFi speed vs wired connection

> Here is what I didn't know before the Tech explained the slow 2.4
> speed.

   That's a very frightening way to begin a story.  (I've heard many
explanations of many things from many people.  Not every one was valid.)

> However.... router communication to the ISP is controlled by the ISP
> by Band and by Channel at the Router. [...]

   That's where your story stops making sense, and begins to sound (to
me) like a fairy tale which was created by a technician with more
imagination than factual knowledge.

> Analogy: Imagine the ISP's coax cable is a 1" pipe. Within that 1"
> pipe are 2 pipes called 2.4 and 5. [...]

   You can imagine that, but I claim that cable-TV ISP service does not
work that way.

> [...] as it turns out, [...]

   How, exactly, did you determine this?

> [...] the ISP allocated the 2.4 pipe to use 30% of that 1" pipe to the
> ISP and the 5 pipe uses 70% for internet access.

   What happens to the wired devices?  How big is that (imaginary)
dedicated "pipe"?

> I am a Comcast Blast customer [...]

   How fast is that service supposed/claimed to be?

   I propose an experiment.  Get hold of a computer with a gigabit
Ethernet interface, and connect it to your C7000.  Run a speed test
using that computer.  How much of your promised speed do you get that
way?  Which (imaginary) dedicated "pipe" is that, and how much capacity
does it leave for the other (imaginary) dedicated "pipes" which are used
by your wireless devices?

   What speed can you actually measure when using a computer/device with
a 5GHz wireless connection?  With a 2.4GHz wireless connection?  Can you
get those numbers to make any sense with your dedicated-pipe hypothesis?

   What happens if you run two speed tests simultaneously, on, say, the
wired computer and your fastest 5GHz wireless device?  How do those
dedicated "pipes" hold up then?

> Try moving as many 5 Ghz capable devices to 5 Ghz one at a time
> checking each one.

   It's certainly true that putting more traffic through the 2.4GHz
radio will reduce the capacity (speed) available to any particular
client device which uses that radio band.  That is entirely unrelated to
the communication between the router and the ISP.

> PS. I did not have any luck with my ISP request to enlarge 2.4 Ghz and
> reduce 5 Ghz use between our house and ISP.

   What kind of "not any luck" was that?  I'd expect a response like "We
can't do that."  (Because I doubt that they could do that.)

   In the real world, I claim, 2.4GHz and 5GHz (and wired-Ethernet, and
any other) communications _ARE_ intermixed going to/from the ISP.

   But why trust me?  For all you know, I could know less than your
technician.  Run the experiment.  Analyze (and reveal) the results of
your speed measurements.  (That science stuff is a miracle.)