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Account-Wide Achievements
To ensure that ESO’s performance can keep up and grow with the game’s new experiences, most achievements will become account-wide with Update 33. This means that an achievement that you’ve earned on any one of your characters may also be considered completed across all your characters. By consolidating achievements, we can retain and improve the way the game handles this type of data and the overall experience. With the database’s overall footprint reduced, it will more performant across the board, which may manifest itself in faster load screens and improved performance on other database-heavy operations. Most importantly, this change helps keep the game performant as we continue to add new content and achievements in the future.
Emphasis mine. Are you really trading replay-ability for a CHANCE that it MIGHT improve performance? Like removing deer from Cyro did? Or is it like when Cyro became no-proc? Maybe it's similar to when all BG mode but death mode were removed?
Why is the game checking databases of characters that aren't being used at any specific moment. As far as I'm aware there is no way to log on two different characters on the same account at the same time. Am I understanding this right? Does this mean all the databases for all of our characters are being loaded the moment we log in game? If this slows the servers down so much the only solution the devs could come up with was to mangle all characters of each player into one, why were so many character slots allowed in the first place?
This change also creates a whole new world of opportunities for your account and characters. For example, Titles rewarded via achievements will become account-wide, allowing you to use them on any character regardless of which one first earned it.
What "whole new world of opportunities"? AWA takes away the opportunity for me to experience Tamriel at its fullest again on my other characters. Not to be pedantic, but opportunity means I still have choices - I can take it or leave it. I won't have a choice come March 14th - my lawful good characters will have the title of Silencer and Master Thief, I won't be able to get Master Angler in any other character because there will be no way to track it. Same goes for most all the other achievements from dungeons and trials.