[estebank]

Code in all languages bitrots. Even if your dependencies are "done", the language is unchanging, the toolchain mature, a vendor can introduce a new platform and all of a sudden your code won't compile anymore, because IBM introduced a new RISC server platform, or macOS changed the definition of time_t, or Windows blocked direct win32.DLL access (I know, a stretch), that your older libraries didn't know about.

[mananaysiempre]

Stretch or not, MDAC can no longer be installed on Windows. (The Microsoft Data Access Components are a rollup of database interface libraries from when they seemed to do around one a year, to the point that Spolsky remarked on it[1].) This means a significant corpus of old but still 32-bit line-of-business apps no longer runs, like anything written in VB6 or VBA that needs to access a database.

[1] https://www.joelonsoftware.com/2002/01/06/fire-and-motion/