why when i switch to a dol am i not at full gp its dumb

[Eidolon]

Because you naturally have 400GP. Anything else is just gear adding on to it.
It's the same reason you're not at max MP or HP when switching to a DoW class.

Actually when you switch to -any DoW/DoM- job from DoL/DoH, it starts you off at 0 MP
When you switch to -any- DoL class from DoW/DoM it starts you off at 400 GP.

The difference is?

Going to a combat class takes about 40-45 seconds to reach your full MP/HP when changed in a sanctuary.
Going to a Gathering class takes about 2minutes to restore 200 GP.

Please don't misinform people.

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As for the OP:

I agree, I would like it if when we changed in sanctuaries, we were given a full replenishment of GP for our gatherers. It's pretty clear the game keeps track of our GP ticks regardless of job (So thankfully, I can get on a Combat class, kill for about 5 minutes, then get on Gathering and have 400 GP.)

I understand their reasoning though. They want you to use Cordials if you want more GP, and since most gathering doesn't -require- the use of GP (You can mine anything without it really, you just won't get as much / as many HQ's) they want it to be a more limited resource.

Compare this to Crafters who have to consume items when crafting, and I guess I see the logic, but it just comes off as annoying. It's especially bad if I choose to log out my character immediately after mining, and when I log in and want to hit a node I have an abritrary wait time because it -doesn't- track GP ticks while signed out.