@Mathias_Westerdahl my results of the texture size:
1.2.179 (webp_lossy) 3.76 MB
1.2.181 (ETC1S) 2.28 MB
1.2.181 (UASTC) 6.07 MB
I followed @Pkeod’s advice to check textures in an empty project. so I have not yet been able to check how it looks visually in live project (I will write in theme of 1.2.181 beta soon) , but results in numbers of ETC1S looks amazing!