I feel that for this the reason, telepathy is what’s needed for any civilization to transcend level 1 on the Kardashev scale. Until we can communicate more information faster than words, humanity probably won’t transcend a type 1 civilization.
There’s also raw speed. The speed of speech is one of the edges we have against most other species. Being able to communicate with raw thought would be even faster.
This goes beyond “unwillingness”