Apt is great, but it does not work with every language. As an example, you cannot use apt with maven (java) AFAIK.

I know this is a joke but im old enough we used to install the os and had it on the network and eventually update it but then it got to the point were like being connected to the internet for like a minute and the machines were compromised. Thats when we got off our duffs and started making custom installs that had updates and configurations and software pre installed before we even connected it to the net.

And how would apt help in this particular case? A supply chain attack can happen with any particular package manager. In this case, the compromised package was detected and mitigated within 93 minutes, affecting a total of ~330 users. Which is a lot better than how a lot of distros handled the xz breach last year.

All reasonably secure package managers (and https) operate on a chain of trust. There is little that can be done if that chain of trust is broken.

Based on this the cause was a malicious VSCode extension that stole credentials that were later used to trigger a deployment CI/CD pipeline. If there's anything to learn from this, it's probably to not use VSCode.

Because they could be changed or have something sneak in the library?

I need to build it, jellyfin-tizen is a separate project for Samsung TVs