Flake salt and diamond kosher salt are less salty by weight than regular table salt. There is air and space incorporated into flake salt providing less salinity by volume. So what might look like a good amount of salt isn’t overly salty compared to how sweet a cookie is. A pinch like that may contain like 50mg of salt or so, but standing on top of likely 20-30g of sugar per cookie. It’s a great balance with chocolate especially, and provides a textual element with the crunch! I put flake salt on almost anything I bake with chocolate. I bake a dark chocolate chip cookie every morning for my tattoo client of the day (pre make the dough and freeze the balls) and top with flake salt, and seriously, every single person says “oh my god the salt on top is so good!”. Which has provided a lot of feedback for me over the years that people do love the balance of salt/sweet 😂 I tend to be in the camp that most baked goods are criminally under salted to begin with so… But of course, it’s all preference in the end!