That's silly. Cache is there for preserving things across many runs of some application. Applications certainly use it in a way that assumes long term storage. It's not for short term temporary things. It's a cache.
It's not going to cause "problems". It's just going to massively slow down many use cases that rely on downloads.
It's not going to cause "problems". It's just going to massively slow down many use cases that rely on downloads.