What's the benefit of the brackets here?

问题

Code:

 (>nul 2>nul findstr /m "^" "myfile.txt") && echo ok || echo empty or absent

I asked because this:

 >nul 2>nul findstr /m "^" "myfile.txt" && echo ok || echo empty or absent

appears equivalent.

来源：https://stackoverflow.com/questions/46085095/whats-the-benefit-of-the-brackets-here