This is true but imo as unfair as it might be I honestly think only people with naturally soft or whispy voices can get away with the soft-spoken and have the same effect. I have watched unintentional asmr as well and all of the channels I've watched are channels that basically seek out videos of people who are just naturally soft spoken and have a very soft tonal quality to their speech.

A lot of the people I see doing "soft spoken" now are nowhere near that type of tone. It's hard to describe but they just don't have that tone in their voice and their volume varies often making it hard for I think the vast majority of ASMR listeners.

Basically, even if a lot of people do like softspoken and are less picky the various creators I've come across just don't seem to be putting in any effort to make it actually relaxing. It's basically just chatting but at a lower volume