So, as an example, 20 years ago when we started a project the devs and I (the sysadmin) would sit down and have a meeting where they would talk about what libra

So, as an example, 20 years ago when we started a project the devs and I (the sysadmin) would sit down and have a meeting where they would talk about what libraries they wanted to use (think CPAN or PEAR) and I would tell them what versions were compatible with our servers and those are the versions they would use for the lifetime of the project. Docker came about because devs got tired of hearing "no" to upgrades and admins got tired of saying it. But in 2023 if there was a zero day (though we didn't call them that back then) for libqxt7.2 (but not 7.0 or 8.1) I could tell you immediately if we were impacted. In 2023 I can't even tell you how many versions of OpenSSL are on my laptop right now as I type.