it's not needed if you're building a JavaScript app with Sublime text.
But compiled environments such as .Net take a lot of cpu and memory. It's not uncommon to have 2-4 visual studios open which can take up 10 gigs of ram. Couple that up with continuous build/unit test frameworks and 5-10 VS add-ons and you need a powerful machine to make it responsive
I'd argue that some of what you describe should probably be an anti-pattern, or is at least a byproduct of very fast, cheap CPU power. Emacs has worked for years on much lower-end hardware and has been used to build some very elaborate systems.
These days a typical developer laptop is 5x more powerful than the system the code will be used on (mobile device, virtual server, etc.)
I do not disagree with anything you said. The only reason for powerful developer workstations is that each second of delay is compounded when you use your machine as a tool. I do use lightweight tools but Visual Studio is still extremely powerful and not easily replaceable (I've been using it every day for past 10 years). Visual Studio is NOT fast. Especially when you add ReSharper into the mix. You could go on arguing about what is the best IDE and if ReSharper is necessary. The fact is that lots of people still use it and a powerful machine is needed today to make those responsive
it's not needed if you're building a JavaScript app with Sublime text.
But compiled environments such as .Net take a lot of cpu and memory. It's not uncommon to have 2-4 visual studios open which can take up 10 gigs of ram. Couple that up with continuous build/unit test frameworks and 5-10 VS add-ons and you need a powerful machine to make it responsive