Since we have a growing list of features that have yet to be implemented into the game, I figured just for fun, since I am bored at the moment, why don't we just list them out. I have included when they were supposed to have been added according to the DMM timeline as well.
Note: I only went so far back, so if I am missing any important things, just let me know and I can add.
Note 2: We are listed as approximately 1 year, 2 months, and 9 days behind DMM.
Note 3: I will try to keep this updated, and when we get the feature I will cross it off with the day it was added.

List of Things that should have been added, but were not yet

• Gold Exchange Shop - Should have been added some time before 7/3/2018
• Danchou Tickets - 7/3/2018 but possibly earlier
• Aqua Shadow Missions - 7/10/2018
• Ability to buy Petals in Gold Exchange Shop - 8/7/2018
• Accept All Completed Quests at the same time - 09/18/2018
• Bond Crystal Exchange Girls - 10/18/2018
• Garden Medals Added (allows you to avoid spending gold) - 11/6/2018
• Ability to mix and match skins between character versions - 11/6/2018
• Permanent Revivals was supposed to start again - 11/15/2018
• Warehouse 2.0 - 12/4/2018
• Loading Screen Trivia (not very important but I kind of like it) - 12/11/2018
• Super Counter and Chance to Resist Death for all Defensive Knights - 12/18/2018
• The 40 Medal Danchou Ticket was added - 1/1/2019
• Solar Drive Revamp (You can now over charge solar drive to 300%) - 1/8/2019

Other Updates - Writing these as these do not really needed to be added unless you have the dates.

• We are missing over 100 Blooms (too many to count).
• We are behind on whaleship, campaign missions, and severely behind on concept missions.
• Quests Severely behind - We should have more stages to the main quests.
• Character Quests.... I ain't even going to go there.