Hey man I hear you. Maybe I’m replying to this late but idc because this needs to be addressed. Riot cares if they make money or not, and because Rek’Sai is not a popular champ, riot doesn’t want to make a skin because they won’t be rolling in much dough. She is still played in LCS and stuff like that so I mean she’s still semi popular but a skin could definitely add to her overall popularity. As far as skin ideas go, unfortunately I do not think a sand theme is in order, unless it’s a skin that riot may try to relate to her lore, where she is a quite literal sand shark. In my opinion, Rek’Sai needs something more related to what she is, as she already has a more silly skin, and a more robotic/red themed skin, so she needs something maybe a bit more formal, so something like Iron Guard Rek’Sai or Vanguard Rek’Sai. I feel like this would show a different side to Rek’Sai because all that we’ve seen of her is a ruthless monster. I think it would be cool if she was protecting something, and given a skin that shows she has reason to kill.
That’s just my very long list of thoughts, and go ahead and downvote because hey! What do I know about riot and rek sai skins?