Parent is saying that the distribution model of modern distros is so legacy and out of alignment with what people actually want that a solution involving bundling the entire damn OS to sidestep that pit of snakes has now became the defacto way to deploy software.
To put it another way, what do you think the relative popularity of distributing your own internal software via a private apt repo is compared to bundling it as a stateless container and putting it on a registry? Some big companies that pre-date containers do it with apt. Most don’t. For good reason.
The company I work at has an internal yum repository that we use for application and certain application dependenices. It's worked reasonably well for us, mainly because we stick with using dependencies provided through the internal or public yum repositories or some other public external yum repositories if a particular dependency is not available otherwise.
I'm sure a similar solution could also work with apt.
To put it another way, what do you think the relative popularity of distributing your own internal software via a private apt repo is compared to bundling it as a stateless container and putting it on a registry? Some big companies that pre-date containers do it with apt. Most don’t. For good reason.