I’ve never agreed with the idea that using more tools makes for more cognitive load. We already interact with thousands if not tens of thousands of tools every day - light switches, forks, door handles, car keys, cash machines, TV remotes, watches, sunglasses, bottle lids, etc. Volume is not the issue.
The real issue is the additional cognitive load involved in learning the new tool. Once you go past memorisation and simply “know” how to use something, it barely has any mental load whatsoever. At that point it simply becomes a question of the functionally of the thing you’re using.
Keyboard shortcuts are good example of this. I have dozens I use daily, but, because I added them one at a time over a period of years and reinforced the learning through endless repetition, there’s no cognitive load whatsoever anymore. If someone else added all my shortcuts to their Mac in one go, they’d probably find it unfathomable, but that’s not because it’s inefficient to use them.
Not to mention the fact that learning how to use a new tool for one purpose often allows you to build more learning on top of it. A global launcher like Alfred or Raycast is like this. Learning the new behaviour of launching and using it might be harder at first, but once you’ve got the habit, it opens the door to adding many few functions with almost no additional effort. It simply builds on the existing habit. Hell, you could make the same argument for computers in general.
Sometimes the cognitive load of switching outweighs any benefits you gain in the long run. This is why the Dvorak keyboard is such a hard sell, you’re overcoming some very ingrained behaviours for a fairly hard to perceive benefit. Even I’ve struggled to bring myself to try it out, and I’ll give anything a shot.
But oftentimes when people think that simpler is better, what they’re actually benefitting from is just getting rid of a poor tool from their setup.
It’s like if someone has a terrible food processor that always gets stuck, leaks, and takes ages to clean, so they simply start chopping stuff by hand and think “this is much easier, simplicity is so much better”. When in fact replacing it with one that simply works would be even better yet.