You can, but you won't. Not regularly anyway, thats not the way you'll run your computer daily. Maybe for a while, but then you'll forget or want the extra power for something and get too used to it. Instead, you'll do it occasionally at specific times.
You've just recreated the problems I was talking about with an optimisation step but in a new environment.
You can be more specific. Don't lower the performance globally, just for the app you're developing. It's easy to automate in your ide configuration / run script / app itself when running in debug mode, etc. It's a one-off setup per project you're developing.
You've just recreated the problems I was talking about with an optimisation step but in a new environment.