Because there are a ton of viruses that cause it, there are a lot of things that look like colds but aren't, things that
could kill a cold may be too high a risk since a cold is a relatively minor thing, etc. That said, there may (or may not) be broad-spectrum anti-virals on the way (1-2 decades)
This is trivially searchable on the web, btw, e.g., https://sciencebasedmedicine.org/you-cant-beat-the-common-co....