That is one key thing I see a disconnect with. I definitely can see the value in having static types in a long-lived/large js project, but at the same time 1) how long does the average js project really stay relevant, 2) people have got by just fine w/o it so far. I’m kind of mixed on it, but for my new web app I’m working on I decided to use vanilla js because it feels much more efficient.
And if you converted your code to TypeScript you'd immediately find the 100 or 1000 bugs you have that you're just unaware of until they bite. People who have done such a conversion before know this, and unanimously will agree. Those who have't are blissfully ignorant.