I'm not sure if people overestimate it either, some people just have strong memory and powerful mind's eye. My memory is probably from early trauma and represents the extreme other end. If anything it can be a detriment sometimes, I'm not sure a super powerful ability to picture stuff really impacts day to day living for the average human in history. There's no reason for it to disappear evolutionary if it's not a big disadvantage.

As examples I don't listen to music that frequently, I just listen in my head. I can hear songs pretty much completely in my imagination. I'll forget lyrics consciously but letting it play and zoning out the proper music and words appear at the right time. I can also watch days of kindergarten(or any grade) like it's video.

If people are trying to do that and can't tell a single visual detail from a memory or hum a passage from a tune I don't think it's a communication problem, there's just a real difference in experience. To be clear from my personal experience not being able forget stuff or not picture stuff you dont want to sucks. And I have some pretty bad tunes upstairs.