Well, according to Google, ASMR stands for autonomous sensory meridian response; a term used to describe a tingling, static-like, or goosebumps sensation in response to specific triggering audio or visual stimuli.
ASMR's purpose depends on the preferences of people and the type of props used to generate certain sounds, which that should be either relaxing or pleasant. I believe its something quite personalized and not everyone enjoys certain sounds and visuals.
For example, I have no interest in food ASMRs, neither Make-up restoration ones since the sounds are too "munchy" sometimes. But I do enjoy ASMR videos of Slime creation / Scoopability and wood carving.
Another type of ASMR video that I despise its people drawing on their iPads, I don't know what's wrong with the sound, but I don't know if its the pressure they put on their pen but the only think I can think of is of slapping their hands and tell them to be less brute on their screens/pens xD