Some suggestions, mostly quality of life, obvious things

[Slirith]

Need a way to tell which dungeons we haven't done

[Niwashi]

Need a way to tell which dungeons we haven't done

And which guildhests we haven't done with our current class.

[OlyverW]

And which guildhests we haven't done with our current class.

There is a first time bonus given on every class / job for a hest that hasn't been completed when you select it in the duty finder

[mbncd]

There is a first time bonus given on every class / job for a hest that hasn't been completed when you select it in the duty finder

Yes, they're asking for a way to know which of those combinations they have not yet done.

I personally would like a "Used" status added to item descriptions of one time use items. I'm aware that they added a notice when attempting to buy these things (just the other day), however you don't actually get that notice unless you're in a position to complete the sale. For instance, I don't know what materials I need to make/buy for certain crafting books because I can't tell which of them I have unless I go and get the things needed to buy them and then try to buy them and see if I get told I can't or if the sale goes through. Why they implemented it in such a way truly baffles me... It should have been clearly visible in the description from the start.

[OlyverW]

Yes, they're asking for a way to know which of those combinations they have not yet done.

Oh I understand now sorry I quickly glanced before I went to lunch guess I should read more in the future

[Alice_89th]

And which guildhests we haven't done with our current class.

You can see this already.
When you look at the rewards, any guildhests not yet done on your current class will have a completion bonus next to the normal rewards. (If you have done them, it will show only the normal exp and gil it will reward, if you have yet to do them on your current class a second exp and gil reward will appear next to that)