Isn't kosher salt literally just regular salt but in a particular particle size? I also use Himalayan and kosher salt but thats because I eat a ton of junk food which has iodised salt. If you're health conscious and don't do that, it's probably not a bad idea to keep iodised salt and add it in times it's not that important you need to pinch the exact right amount in your fingers or whatever.

That’s fine for people who have a balanced diet rich enough in iodine. Which, to be fair, should be most people bothering about sea salt in the first place. For those who do not, it’s unfortunate, though. There is a reason why adding iodine is a good idea in the first place.

Sea salt and kosher salt also come iodized, it's an independent feature.