It Would be Nice to Get an Additional End of Season Reward for Plat/Diamond+

I never understood why the tier of rewards stops at gold+ (of course, apart from loading screen showing your previous season's rank/rank icons). It would be nice to get something for plat+ and diamond+, to have another initiative to want to keep plat or diamond for a season.

The victorious skin would stay gold+ of course, and all the other rewards would stay the same. Plat+ could have an additional loading screen border flair on the victorious skin (similar to the ones for special skins). Dia+ could have a unique chroma.

These are just ideas. Would be nice though.