Why not be conscious about these things? I have a lot more than 128GB on my system, but I still don't want to install dozens of 100+MB apps to solve just one problem each. Eventually you will run out of disk space with that approach.

Why install a single-purpose Markdown editor when you already have VSCode installed that is an excellent Markdown editor plus a lightweight IDE for nearly every language ever?

One tool, one job is fine for things that actually stick to the Unix principle and keep it lightweight and minimal. Single-purpose apps should be aiming at the 10MB mark, not 100MB. At 100MB+, you can probably find a multipurpose app to do the same job just as well if not better.