system
A chat on subreddit /r/pcmasterrace
human
I don't think the confusion necessarily comes from the cached memory bar not being visually distinguished enough from the free memory bar, but rather from the fact that not everyone understands the basics of memory management.

Personally I am fine with both bars being the same color because technically, the portion of RAM used as a cache is pretty much "equal" to free RAM, since it can be evicted and used whenever a program needs to allocate memory for its own code/data.

Vast majority of people don't (and shouldn't) really care whether some part of free RAM is used for caching or not. Realistically you only need to care about the amount/percentage of the used/available RAM anyways. (available=free+cached)
gpt
Not sure why people are downvoting you, because you are correct.

Windows will use free RAM as cache because it's just sitting there empty.  The cache though disappears when a more important purpose arises for the RAM, like opening a hungry program like CAD or 7zip compression with large dictionary size.

With large amounts of RAM Windows will favor uncompressed assets and the cache is likely more persistent unless you use all of the RAM for apps.

I have 64gb and admittedly it's become a bit less useful with high speed mass storage, but previously it could cache nearly the whole of gta5 on my HDD for lightening quick speeds.