When I updated the client after the maintenance on Sept. 16th, I noticed many things looked strange. Upon closer inspection, I could see that many icons had been revised/changed.
Some of them look better, generally very nice on the eyes. When you have so many icons on the screen, some artwork can be straining for your eyes - which is why I suspect this was revised.
Unfortunately, much of the artwork looks much worse and some of them have been rendered undiscernible or unreadable. Some of the colors are very dull. Some of the icons have been changed for seemingly no reason, but I'm sure someone was being paid by the hour, incentivizing what the entire player-base now has no choice but to live with.
A separate issue that arises when people start changing things without proper testing is unforeseen consequences. Poor compression on icons for currently active buffs make them look pixelated while they are reduced in size.
Here are some examples of changed icons that should be reviewed by someone who understands the influence that quality has on the perception of current and prospective customers:
https://i.ibb.co/12pTXZf/Screenshot-2020-09-17-170057.jpg