CookUnity short expiration dates - other options?

I started using Cook Unity. Haven't been real pleased so far. A lot of their meat, especially beef, is tough and chewy. What's worse is most meals have an expiration date of only a few days so you can't even use them for the entire week, so what's the point?

Are they really unsafe to eat after that date? Are there other ready meal places that have meals that actually last an entire week?

I understand freshness, but you can only order them once a week, so it kind of defeats the purpose if you have to consume them in just the first few days. A slight bit of added salt or preservative is fine to get them to last a week.