I just got an achievement for the first time in ages. It popped up when I killed a unique in a low level area and I was curious what exactly it was so I clicked on the achievement popup. The in-game currency is available at the professional online gaming house. The interested gamers can poe trade currency from those professional online gaming houses in the most affordable cost.
The achievement interface is from the early 00's almost. Same with many other aspects of the game like the guild system, MTX store (up until very recently), character information, Ingame tooltips, settings menu etc. They are all extremely outdated and I assume all of them are on the hit list.UI changes just take time to implement because there is a lot of graphical errors that can come up by moving things around. Requires a lot of testing with various different system settings.
GGG is aware of a lot more of these issues then we even are. They have a very long list of things they really want to change. This stuff just takes a very long time to do so. And it can also interfere with the development of a new league which is where their money comes from. So it's not easy to smash out QoL after QoL update.
I don't think they're a particularly weak point, but there are definitely improvements you can make without compromising the integrity of the game.
Horizontal item stacking - Users know roughly where to look for something like a Jade amulet on a vendor, but sometimes it might be at the very top or at the very bottom of the screen based on what items the vendor has populated. In a horizontal stacking scenario, the user knows exactly where the "jewelry" row is and better evaluate what's in stock.
Complexity and Categorisation
Getting a new gem from Act 6 isn't hard if you know what you're looking for, but you're a new player and haven't memorized the icon, know what the skill is called or know the location of that "type" of gem then you're going to be in a "what the fuck am I looking at" scenario. Does it add valuable complexity to the game, or is it just a pain in the ass? How could we better categorize the skill gems to reflect where you might find something.
Does shift clicking 200 times really give an orb of fusing more "weight"?
Food for thought at least. There's lot of intentionally "clunky" systems in PoE but some of them are in need of improvement for the sake of modernality.