Why am I not allowed to keep my old Username for login anymore

Imagine my surprise when I opened my client, and Riot's new system declared that I HAD to change my Username, no selecting my previous one, nope. Not allowed. Man, screw yourselves. I LIKED my username
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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