Since new iMacs no longer ship with a built-in optical drive, and Apple did away with iDVD maybe Apple didi away with a lot of optical disc burning functionality?
I never upgraded to Yosemite, did Yosemite do away with burning multi-seasion CDs/DVDs, too?
Toast has the advantage that if you do not have iDVD, for making custom DVD menus, Toast has its own set of custom DVD menus, too!
Plus, with new versions of Toast and a Blu-Ray reading and writing drive, you can create Blu-Ray content, as well as standard CD and DVD content.
If you own a Mac, then $99 for the non-Blu-Ray version isn't a big expense for DVD authoring software if you create a lot videos or audio discs or you do a lot of disc burning for different uses and applications, like for archiving.
I like Toast better for creating archival discs than using Apple's own disc burning options.
My opinion here, for what its worth.