Shouldn't Thyrus+1 be the last item I get when it comes to using Myth tomes?

[RaijinkenXIII]

Here is my current gear:
http://na.finalfantasyxiv.com/lodest...acter/2891397/

Here is the build I wish to have:
http://xivdb.com/?wardrobe/5555/My-White-Mage-Build

Thyrus and Thyrus+1 comparison
http://xivdb.com/?compare/items/2052-6262

Cleric's Culottes and Darklight Breeches of Healing comparison
http://xivdb.com/?compare/items/3497-6077

This is my first MMO so this may sound silly because I'm probably missing something here but is it really recommended a White Mage get their Thyrus+1 before anything else? The difference in stats is not that great when comparing it to regular Thyrus and when I look at the stats for something like cleric's culottes and compare it to the darklight breeches of healing, the stat boost is that much greater than Thyrus+1 IIRC. This pretty much applies to any AF2 gear, so why is everyone pushing White Mages to get their Thyrus+1 first? I'm currently running Bahamut's coil for its healer loot and I had plan to get Thyrus+1 as the last item for my build, to be completely honest. Is that a bad idea?