Maxperson
Morkus from Orkus
Acolytes don't select a domain in the same way a cleric does, but they do have to consider them. 5e has equated domains to religious sects and as priests of their god, acolytes will have to pick the sect(domain) that they wish to belong to in service to their deity.I agree with Chaosmancer here. The context of the domains being in the cleric section as functional subclass power they pic k, the acolyte background saying they need to pick gods but not mentioning domains at all, and this quote showing up in the appendix on gods I feel the natural way to take the quote is that acolytes and clerics need to pick gods from the list or the DM's selection and clerics need to consider their god's associated domains.
I do not feel the natural reading of the PH is that acolyte background rule requirements are hidden in reading a complex sentence in an appendix in a certain way.
"If you're playing a cleric or a character with the Acolyte background, decide which god your deity serves or served, and consider the deity's suggested domains when selecting your character's domain."
Since non-cleric acolytes do not otherwise select their character's domain I do not feel this establishes a 5e requirement for them to do so.