No worries at all, I'm always happy to see engaging discussions on here.
What do you mean by "keep up"? When I read this I assume you mean they struggle to stay relevant in the game when other champions are added. That is a concern when we create new champions for sure. We don't want to release a champion who is just a better version of another (in multiple aspects, but here I'll focus on power, theme, and role/identity).
There will always be some overlaps, and those can be good, think of the champions with very little overlap (Teemo, Singed, Asol) and you see some of the most misunderstood and least popular champions. What we want to avoid is too much overlap.
In the case of Sona and Seraphine, there is a lot of overlap at a surface level. But Seraphine is primary a mid laner, requiring levels and exp to do her job. While Sona brings powerful (and hard to appreciate auras and team buffs. Their Ultimates and Ws (2s) are similar for sure, but even with tha...
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