The way I read the announcement was that the slime cat was ONLY available in Normal. Heroic rewards a title and Mythic rewards sonething else (I forget what it was…). There is no feat of strength or associated reward for LFR.
For solo players there is Honor PvP gear and LFR gear, both of which are not very compelling. I had really hoped that the Dragonflght PvP gearing system would be tested out for S4 but doesn’t look like it.
S4 is in 4 days. Nothing is going to change between now and then so save your breath.
The only real decision left for me as a Solo player is if I’m going to keep paying to play this game for 5 more months. Even with access to the Alpha and having an outsized platform to communicate my thoughts on the game I’m honestly not sure if I will. Five months is a very long time to live with the results of my feedback on this period of time being almost completely ignored.