I like the spirit of this article. We don't really have a successful paradigm for how to design ambitious user interfaces for power user tools.

But I'm not sure I agree with most of the examples.

For example, Slack isn't really a power user tool. It's a tool that does its job best if everyone in the organization can understand and use it, and making it more like a terminal isn't going to help with that. Speeding it up would still be beneficial, of course. (Also, it looks like there are plenty of terminal clients for Slack if you're in to that.)

Things like animations can actually be very helpful in giving you an almost visceral understanding of the spatial logic of the UI. Without animations it becomes very abstract. It's about balance obviously, using repeated slow animations for branding purposes is not a good idea in a tool like a password manager that you unlock 20 times per day.