I still find typing in Python and TypeScript hugely beneficial, even just for how it makes my editor work better. Being able to click to a definition does wonders for reading unfamiliar code
In python, go and C maybe, but in typescript? People tend to kungfu-type their APIs way too much where healthy repetition would suffice.
I believe ts typing power will eventually become “considered harmful”. I also think that ts should have a way to intertwine types as it does now, but leave that to technical part of dts and give a way to declare that by <that gibberish> you meant <this clear interface>.