Why am I forced to change my username?

Seriously, I've had my username for ~10 years. Why am I being forced to change it now? Just transfer my username over to the new system. If I don't change it I can't play league. This seems like a silly hill to die on by Riot. I won't be playing until I can keep my same 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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