"unused memory is wasted memory" is a meme, technically true from a narrow point of view, but leading to bloat and encouraging bad practices. A little bit of care could shave off orders of magnitude of memory use, as well as performance, which could ultimately allow for cheaper computers, sustainable use of legacy hardware and keeping performance reserve for actual use. In reality, I the idea of increased efficiency by using more memory ultimately leads to software requiring that memory that used to be optional, and software not playing nice with other programs that also need space. Of course even with the idea to have everything ready in memory, software is not generally snappy these days, neither in starting up and loading even from fast SSDs and during trivial UI tasks. Performance and efficiency is also generally not something that programmers regularly seem to consider the way real Mechanical-, Civil-, or Electrical Engineers would when designing systems.

I accept trade-offs concerning development effort and time-to-market, however the phrase "Unused memory is wasted memory" does not seem appropriate for a developer who's proud if their work.

Little friday rant, sorry :-)