Leveling scrying and excavation to level 5 is the same for all characters.
But starting at level 5, progress is done through purple and later gold seeds.
The problem is that all purple seeds do only appear once per account in each zone.
This makes it horrifyingly hard to level up scrying and excavation past level 5 on characters other then your main that has those skill lines at 10.
The purple excavations should be doable once per character in each zone, not once per account.
You could just replace the reward for those excavations with a much lower reward.
Or you should move the treasure chest glow passive to excavation level 5 (or lower), so that it is attainable on all your characters, because this would be the main reason to level up excavation on multiple characters.
As it stands now, the skill progression is totally broken, and forces you to do an insane amount of low green/blue excavations to level up. Making leveling the skill line on other characters such a chore, that it's not worth it.
This can clearly not be the intended design...
Kind regards,
Michael