> Do people actually believe that there are too many keywords?

Yes they do. Just imagine seeing the following in a single file/function: Sendable, @unchecked Sendable, @Sendable, sending, and nonsending, @conccurent, async, @escaping, weak, Task, MainActor.

For comparison, Rust has 59 keywords in total. Swift has 203 (?!), Elixir has 15, Go has 25, Python has 38.

> You can still used gcd.

Not if you want to use anything of concurrency, because they're not made to work together.