PS4 struggle

[Niwashi]

A keyboard is definitely needed for chat. (One tidbit, though: for repeatable quests that want you to say something, the PS4's on-screen keyboard is actually easier because of its predictive text feature. Once you've typed something before, it will recommend that phrase later. All I have to select is "A" for it to recommend "Amid the Flowers" since that phrase is used in one of the Ixal quests. Only helpful if the quest is a repeatable one, though.)

For targeting, it can help to set up different target filters. You can designate a filter where the right/left keys will only cycle between enemies, another where they'll only cycle between players and NPCs, and so on (up to four different filters, each customizable). Also, you can press circle to remove your previous target, then press X to target the nearest enemy. Sometimes that "nearest" criterion is more useful than the next in the cycle from what you'd been targeting before. (The only downside is that that X to target the nearest enemy/object/NPC/whatever does not use your targeting filters. Only the left/right cycling is customizable that way.)

EDIT: Oh, and in case you haven't found it yet, the up/down keys cycle through the party list — particularly helpful for healers.

Also, for hotbar slot space, be sure to set one of your cross hotbars as an extended bar (and perhaps another as W crossbar). These can then be removed from the list of bars you cycle between because you'll have another way to access them, (both R2 and L2 to reach your extended bar, or a double-tap of R2 or L2 to reach your W crossbar).