Why Can We Not Pick from Level Borders We've Reached Already?

To be more specific, why do we have to use our current level's border or our ranked border compared to previous borders from levels we've unlocked already? I really would prefer to have an option to keep a certain border if I'd like, just a suggestion that I hope gets noticed.
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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