As a player who quit mid HW and came back during the end of SB, I'm still surprised they haven't added:

1. an official in-game parser
2. an official in-game voice chat

I've been wanting these features since ARR these are big problems for PS4 players... in previous expansions communicating with other players are key especially when doing savage content and playing with a mix group of PS4/PC players. Also being able to see how much damage each member in your group is doing you can see which members are falling behind and need to improve, if they added these features for PS4 players it would increase the % of players clearing these content as it would most likely improve players as some don't even know if they are playing their job correctly or to the maximum. Also some PC players probably don't like using third party tools so an official one would benefit them as well.

Looking to join a static or creating one yourself also gives you a huge disadvantage as a PS4 player as less players are going to join your static or let you join theirs if you can't communicate with them on voice-chat. Parsing is the same as well as I used to be a leader of a static but was never able to tell which members are lacking behind others and you can't really improve as a team as a whole if someone doesn't point that out.

As long as they make it so players can opt in or out of joining a parse during content or in-game voice chat because not everyone is comfortable in doing so then I don't see any real reasoning as to why they haven't already added them.