You are talking out of your arse… and so am I.
Unless we have well researched data, it is just a opinion.
My opinion and experience is definitely different than yours, and I have seen that objective c leads to more productive teams if they are mostly senior people. (With a couple of libraries (just some helper categories on strings and arrays) and some sparse macros objective c becomes a very productive language. But it takes a senior team to do that well).
Meanwhile with swift you feel you have to please the compiler at every! step? And it really doesn’t lead to much safer language anyway (swift bugs are different) and you feel you have to fight the compiler in every way.
Objective c is less fuzzy, and while it lets you do dumb/fast things (especially important during prototyping) it gives you a clear ‘you are doing x wrong’ warning which gives you the best of both worlds
Fast prototyping when you need it, and safety when you need to ship (you can have a production build fail on just warnings)