Casual content has roughly been the same since the game started. If you couldn't find a goal in it before I'm not sure how a small. 5 patch will fix that.
As for how this patch affects casuals, it really depends on the type of casual you are. My family all play this game for various things. I'm an altoholic when I'm not progression raiding. I actually do enjoy pugging and meeting new people so I level alts with the goal of beating the current raid on normal with no help from my guild at all. This patch gives me tons of help in that regard. From the ability to get to 40 renown easy, to skipping the covenant questlines.
My brother plays to collect things and in a small group of irl friends. He's happy about the changes to the system when it comes to swapping covenants and the way those covenant's collections are now handled
And last is my mom. She's honestly just happy to be pointed at things to kill. She just likes to go around and do world quests in her off time. She doesn't touch any group content, and she's happy. Now there's nothing in the patch that'll help her, but i don't I could think of anything that'll make her enjoy it more then she currently does.
Tl;dr Depending on the type of casual you are and the reason for playing, there's ton in this patch that'll improve your quality of life