Every new UI that got rolled out with Odyssey is garbage all around. Instead of just modifying the existing one like they did with the in-ship UI (the center console where they changed up how to disembark and such) they replaced it with something that is just beyond frustrating to use. Since alpha launched, there hasn't been a day that I logged in to play Odyssey where I didn't curse the UI and wish I could just have the old one back.
I don't care if the old UI wasn't pretty. It worked, and had all the info I wanted to see easily accessed with a minimum of mouse clicks. During alpha, people kept saying "You just have to get used to it, then you'll like it." but this isn't the case. A month and a half and hundreds of hours of play later I know where everything is and I still LOATHE this UI.
SYSTEM MAP: requires dozens and dozens of clicks to do things that used to take one or two clicks. Info that was accessible on one panel before is now buried in multiple tabs and the information is somehow LESS visible. I used to be able to tell if a world was terraformable at a glance. Now I have to stop and read through the planet type's description because all the text is mashed together.
GALAXY MAP: also requires far more clicks to use than the old one and again, info is buried in tabs where it's all smashed together. No ability to mouse-over stuff to display things, you have to click and half the time it requires multiple clicks to get the UI to actually select the thing you want. Also, having to hold down the mouse button to plot a route is a stupid idea. I hold down the mouse and the the map starts to move and shifts off the star so it stops plotting the route. Who thought this up? Why not just have a button to do this? Why do I need to hold down a button?
MISSION BOARD: What was wrong with the old one exactly? It was far more intuitive to use and the new one seems to lag out horribly when you try to access it. I suspect it's because it's trying to load all these faces at the top whereas before you only saw a face when you clicked on the faction to see the missions they are offering. Either way, I find this thing a giant pain to navigate and actually had a far easier time finding missions I wanted to take on the old one.
OUTFITTING: Total mess. Once again, info is harder to find. The whole thing requires a frustrating amount of clicking, backtracking and more clicking to find or do anything and a lot of things (like storing a module instead of selling it when swapping something out, for example) isn't obvious. So much so that even months later, people are still not seeing it.
Unless the point of this new UI was to annoy your player-base, then I would say that it's a total and catastrophic failure that should be reverted immediately. I'm sure if you had asked, the players would have been more than happy to tell you what minor QoL changes were needed to the old UI and you could have saved yourselves a lot of work on something that ultimately wasn't needed and isn't wanted by the majority of players.