Why is it not simple to build and run the project on the computer you would normally run it on? I know: the modern crap is voluminous. Think of Jeff Goldblum'

Why is it not simple to build and run the project on the computer you would normally run it on? I know: the modern crap is voluminous. Think of Jeff Goldblum's line in Jurassic Park "that is one big pile of shit".