What's a map allowance?

[Thaliss]

Hi,

Easier to stack everything on a character.

Example cross class skill. As a White mage you can use some skills of Arcanist and Thaumaturge. The Thaumaturge has a skill at level 26 very interresting. But as you leveled already at 26 why not 30 to become a Black mage.
But black mages can use some skills from Arcanist and Archer. The archer have a reduce aggro skill interesting for black mages at lvl 42 (I think or maybe 36, 42 must be mantra). If you level archer you will probably get it Bard.
Bards share some skills with....

you see the trend

Also to unlock job you have to level another class to 15 (depends on job you are unlocking), so you probably get to level it anyways.

And you could do just for the achievements, unlocking all jobs, all relics...

But you are correct that on the other hand multiple alts would allow to bypass daily/weekly lockouts
Some do both