So in that quote you've told me what a monk does AND how a monk does it. You've then told me what a WHM does but you HAVE NOT said how a whm does it. you are not being consistant. there are 3 variables in this comparison. what a job is. what a job does and how a job does it. you need all 3 of those to justify any arguement.
for white mage you are only giving two variables. what a job is and what a job does. and you are using those to validate your point because by your standards. what a job is is a whm. what a job does is heal. your arguement then is that because of that it should be the best healer.
to apply those same standards to another class. what a job is is a dragoon. what a job does is dps. thus because of that with your arguement a dragoon should be the best dps.
what you are doing however is adding a third variable to dps class but deliberately omitting it from healing. and without consistancy your arguement has no merit.
I would hope a chemist could do things a whm can't otherwise its pointless. Just as i would hope every dps class has different skills. i would also hope a whm can do things a chemist can't. maybe a chemist cant protect or stoneskin the party. but maybe it can increase a party members max hp by 20%. maybe a whm cant increase a party members max hp with magic but it can cast stoneskin and protect. and maybe they can both heal for equal amounts of hp. (whm via cure spells, chemist via potions and tonics)
what you would have then is 2 completely seperate utilities. imagine your tank has 4000 hp. with a whm to support and stoneskin him maybe he can take 5000 damage and survive. (i forget how potent stoneskin is so ill just say 1000hp) now imagine instead that paladin has a chemist healing him. with a max hp potion maybe that paladin has 4800 hp. thus he could take about 4800 damage and survive. you could argue that in that scenario a whm is marginally superior
But imagine if that paladin had both to support him. he could be sitting there able to take a whopping hit for 5800 damage and still stand. (4000 + 20%maxhp + Stoneskin) that is undoubatbly better than simply having 2 white mages. thus both jobs are able to heal but also bring different abilities to the table.
Were you meant to say that? it sounds like you're agreeing with me and then at the same time completely ignoring it.
Your arguement is:-
WHM should be the best healer because that is what its designed for
which means
<job> should be the best <role> becasue that is what its designed for. <<<<that is your arguement 2 variables <job> and <role>
so...
drg should be the best dps because that is what its designed for
mnk should be the best dps because that is what its designed for.
blm should be the best dps because that is what its designed for.
pld should be the best tank because that is what its designed for.
See the problem?