Software is a gas, it expands to use all available resources.

I have 32GB of RAM, and run out occasionally. At the moment I have two CAD programs, thousands of pages of datasheets and reference manuals, an IDE, and ~50 browser tabs open. I don't HAVE to have them all open at once, but it does save me a lot of time.

My next machine will have 128GB, and I expect that will run out of memory too.

Also, sometimes you need to use software that has a memory leak, so a bit of extra RAM gives you some more time before it crashes.

Photogrammetry can also get resource hungry.