In music, why are the locations of notes not the same on the treble clef as the bass clef?

Actually they are, kinda sorta . . . kinda.

BTW, that's a really good question!

Well, to start with, they aren't even the same in the treble clef as they
are in...the treble clef!!! Huh?

OK, look at the staff. 5 lines, 4 spaces, 9 possible note locations, and...
8 notes! The lines go from E, on the bottom line, up to F on the top line.
So where's the 2nd E? In the top SPACE. One E on a line, one in a
space. And the lower F is in the 1st space.

Let's assume the treble clef is the "standard". My question to you is...
Starting from middle C, going up 1 octave, are the C's in spaces ...
or on lines? Hmmm ... one of each!?! 2nd question is ... Was that
ever an issue with you before now? I bet not.

In general, no one has a problem reading the treble clef. They see a
note on the bottom line and play E. They see a note in the top space
and play...E. They start at middle C, 1 LINE below the staff, and play
up an octave, ending on C in the 3rd SPACE.

Start with C above middle C and work down. C is in the 3rd space, right?
B is on the 3rd line, and so on down until you get to E, on he 1st line.

Now keep going. D is in the 1st space below the staff. C in on the 1st
line below. . . . Keep going down to E, lowest you go in "treble" clef. It's
in the 4th space below the staff. F being on the lowest line below the staff.

Well, once you get below the treble clef, those added lines are simply for
your convenience so you don't need to have the whole bass clef there, too.

BUT . . . you are actually reading the bass clef. And if you were to
continue down, below that low E, still adding additional lines, you'd
see D on the next lower, 4th line. And finally C on the next lower space.

So you'd have 4 lines below the staff. Right? And C in the 4th space
below the staff. Going up and playing the 3 C's, you'd have one in a
space, the next one on a line, and the last one in a space.

And if you continued the treble clef UP, adding spaces and lines,
you'd get to the next C, on a line.

Well, go back to the treble clef. Let's go one octave up, then one octave
down from middle C. Middle C is on the 1st LINE under the staff. The
next higher C is on the 3rd SPACE. I bet you never had an issue with that. BUT...when we go back to middle C, and go down ... that next C is also
in a SPACE, we think it's weird and therefore need to "learn" bass clef.

Well, we don't. If you can read middle C on a line, and up an octave to
C in a space with no problem, then going from middle C on a line down
an octave to C in a space shouldn't be any more difficult.

We just tend to "think it" into a problem. Don't think it, just play it.

Go back to the C above middle C, in the SPACE. Continue up another
octave. Guess where the C will be. On a LINE.

It's all just one big Great Staff, or if you're from England, One Grand Stave.

My primary instrument is guitar. So I never play a note lower than low E.
The treble clef is all I really need, because of the added ledger lines. But
when I'm composing, or working with bass guitar, or piano, I don't actually
think. . . treble . . . bass clef. No more than I would think "C top space", or
"C 1 line below". I just think . . . C.

I know, I'm a bit windy. And a little redundant. But hopefully I got the
point across. : )