They are iLevel 90 so yes, they are "worth" it.

All your stats are based on your level. From 1 to 50 you gain around 25% more efficiency in stats.
Strip a level 50 down to their main hand and see.

For a Whm it's easy to test.

Strip down, self heal with a level 5 cane. Then Self heal with the best cane you have.
Put on level 5 gear, HQ. Self Heal with your 5 cane and your best cane.
Put on all your best gear and self heal with your 5 cane, again with your best cane.

You will be able to see what does what. Most changes you make will increase or lower your stats by 25% one way or the other but the cane will in fact heal by as much as 250% more, just based on the item level of the cane. It's why I laugh at people trying to convince themselves that i70 crafted can be made to compete with i90 based on stats in the materia. No amount of stat buff can mitigate 20 item levels.

When they offer us item level 95? That is by default BiS. Nothing trumps level in FF14. Nothing.