Headshots or body shots ? Help needed

I have played Halo since the very beginning and it’s second nature in any engagement to go for headshots, Although I normally finish with high headshot count i obviously miss shots instead of going to the body then switching to the head.

How have people transitioned from the old school headshot only to the new way and how do you find it ?
I want to know if it’s worth the pain of re training my brain to do this.
Thanks

You mean that you only aim for the head, even on fully shielded enemies?

Yes, automatically and that’s the problem.
I just can’t seem to switch and wondered if that’s how people play now and how much more effective is it ?