Omg was literally just thinking this, but for Audible. Was trying to listen to a book and 1.75 is the optimal speed for a leisurely car ride! I got frustrated by both 1.5 and 2 so went back to music. 🤪
I guess they don’t pay much attention to that part of the player, so browser plugins such as YouTube Playback Speed Control (which offer 2.0x+ speed) became popular.