I have been a top main since mid season 7, my elo span from mid silver to low diamond. Before season 10, she was the hot pick, the yasuo of top lane. But I cannot remember the last time I lane against a Riven player, probably not in the last 2 seasons. I don’t read the patch notes often, but i don’t think she got a new skins or any buff/nerfs recently. This could be a server issue tho, I play in VN server. I miss playing against her, not because she is weak but riven players push me to my limits to notice and punish their mistakes
Short answer: she isn’t unique any more